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C1 verb /ˈɪtəreɪt/

iterate

迭代
Meaning
To repeat a process or statement, often to improve or refine.
Example
The software team will iterate the design until it meets user needs.
软件团队将反复迭代设计，直到满足用户需求。
C1 adjective /ɪmˈpɜːrsənl/

impersonal

非个人化
Meaning
not influenced by, showing, or involving personal feelings; lacking human warmth or emotion
Example
The letter was written in a very impersonal style.
信件是以非常非个人化的风格写的。
C1 noun ɪnˌɛv.ɪ.təˈbɪl.ɪ.ti

inevitability

必然性
Meaning
The quality of being certain to happen and impossible to avoid or prevent.
Example
The inevitability of change is a part of life.
变化的必然性是生活的一部分。
C1 adjective /ˌɪnədˈvaɪzəbl/

inadvisable

不建议
Meaning
Not recommended; likely to have undesirable consequences.
Example
It is inadvisable to drive in such heavy rain.
在这种大雨中开车是不建议的。
C1 adjective /ˈɪrɪtəbl/

irritable

Meaning
easily annoyed or made angry
Example
She became irritable after working long hours without rest.
C1 noun ɪnˌten.sɪ.fɪˈkeɪ.ʃən

intensification

强化
Meaning
The process of becoming or making something more intense or extreme.
Example
The intensification of climate change requires urgent action.
气候变化的强化需要紧急行动。
C1 adjective /ˌɪndɪˈstɪŋkt/

indistinct

模糊的
Meaning
Not clear or sharply defined; vague or blurred.
Example
The sound of voices was indistinct in the distance.
远处的声音是模糊的。
C1 noun /ɪˈreləvəns/

irrelevance

无关性
Meaning
the quality of not being connected to or important for a particular matter; lack of significance
Example
His long explanation only highlighted the irrelevance of the details to the main issue.
他冗长的解释只凸显了这些细节与主要问题的无关性。
C1 noun /ˌɪnflɛksɪˈbɪlɪti/

inflexibility

缺乏灵活性
Meaning
the quality of being rigid or unwilling to change; lack of adaptability
Example
The inflexibility of the rules caused unnecessary delays.
规则的缺乏灵活性导致了不必要的延误。
C1 noun /ˌɪn.səˌbɔːr.dɪˈneɪ.ʃən/

insubordination

不服从
Meaning
Defiance of authority; refusal to obey orders.
Example
The soldier was punished for insubordination during the mission.
士兵因在任务中不服从命令而受到惩罚。
C1 noun ˌɪrɪˈvɜːrsəbl ˈdæmɪdʒ

irreversible damage

不可逆的损害
Meaning
Harm or injury that cannot be undone or repaired.
Example
Climate change causes irreversible damage to ecosystems.
气候变化对生态系统造成了不可逆的损害。
C1 adjective ɪmˈpɛkəbl

impeccable

完美无瑕
Meaning
In accordance with the highest standards; faultless.
Example
His impeccable taste in fashion was admired by all his peers.
他的完美品味在时尚界得到了所有同事的赞赏。
C1 noun /ˌɪm.pəˈzɪʃ.ən/

Imposition

强加; 负担; 不公平的要求
Meaning
the action or process of imposing something or of being imposed; an unfair burden or demand
Example
The imposition of new taxes without consultation angered the citizens greatly.
未经咨询强加的新税让市民极为愤怒。
C1 adjective ˌɪn.təˈstel.ər

interstellar

星际的，星际间，宇宙的
Meaning
Occurring or situated between stars.
Example
Scientists study interstellar travel possibilities.
科学家研究星际旅行的可能性。
C1 noun /ˌɪnkɑːrˈneɪʃən/

incarnation

化身
Meaning
the embodiment of a deity, spirit, or quality in a physical form
Example
The monk was considered the incarnation of compassion.
这位僧侣被认为是慈悲的化身。
C1 adjective /ɪnˈsɪdiəs/

insidious

阴险的
Meaning
Proceeding in a gradual, subtle way but with harmful effects.
Example
The insidious spread of misinformation can damage trust.
错误信息的阴险传播可能会损害信任。
C1 adjective /ˌɪməˈtɪəriəl/

immaterial

无关紧要
Meaning
Not important or relevant; lacking physical substance.
Example
The judge ruled that the argument was immaterial to the case.
法官裁定，该论点与案件无关。
C1 adjective /ɪnˈses.ənt/

incessant

持续的
Meaning
Continuing without pause or interruption; constant.
Example
The incessant noise from the construction site made it hard to concentrate.
建筑工地上不断的噪音使得集中精力变得困难。
C1 verb /ɪmˈbɛd/

imbed

嵌入
Meaning
To fix firmly or deeply in a surrounding mass.
Example
The journalist imbedded himself with the troops to report firsthand.
记者将自己嵌入部队中以第一时间进行报道。
C1 verb /ɪmˈploʊd/

implode

内爆
Meaning
To collapse or burst inward violently.
Example
The old building imploded during the demolition.
老建筑在拆除时发生了内爆。
C1 adjective /ˌɪmprɪˈsaɪs/

imprecise

不准确
Meaning
Not exact or accurate; vague.
Example
His explanation was too imprecise to be helpful.
他的解释不够准确，无法提供帮助。
C1 adjective /ɪnˈdetɪd/

Indebted

负债的; 感激的
Meaning
owing money or gratitude to someone; obligated; grateful
Example
I am deeply indebted to my teacher for all her guidance.
我对我的老师为我提供的所有指导深感感激。
C1 adjective /ˌɪnˌkɒnsɪˈkwɛnʃəl/

inconsequential

微不足道
Meaning
Not important or significant; too small to matter.
Example
The mistake was minor and inconsequential.
这个错误是微不足道的。
C1 adverb /ɪnˈvɜːrs.li/

Inversely

反向地; 相反地
Meaning
in a way that is opposite or contrary; in reverse order or manner
Example
The price of goods is inversely related to their availability in the market.
商品的价格与其在市场上的可得性成反比。
C1 noun /ɪnˈsɒm.ni.ə/

Insomnia

失眠
Meaning
habitual sleeplessness; inability to sleep; the condition of being unable to sleep
Example
Her chronic insomnia made it difficult for her to concentrate during work hours.
她的慢性失眠让她在工作时难以集中注意力。
C1 adjective ɪˈneɪt

Innate

与生俱来的或自然的
Meaning
Existing from birth or natural
Example
She has an innate talent for music.
她有天生的音乐才华。
C1 adjective /ˌɪnɪkˈsplɪkəbl/

inexplicable

无法解释
Meaning
Impossible to explain or understand.
Example
The sudden disappearance of the file was inexplicable.
文件的突然消失是无法解释的。
C1 noun /ˌɪnkwɪˈzɪʃən/

inquisition

宗教裁判
Meaning
A prolonged and intense questioning or investigation, often harsh in nature.
Example
The journalist faced an inquisition from the panel about his sources.
记者面对小组对他消息来源的严厉质询。
C1 adjective /ˌɪnədˈmɪsəbl̩/

inadmissible

不可接受
Meaning
Not allowed, especially as evidence in a court of law.
Example
The judge ruled the evidence inadmissible.
法官宣布证据不可接受。
C1 noun /ɪnˈsɜːʃən/

insertion

插入
Meaning
the action of inserting something into something else
Example
The insertion of the new data was completed successfully.
新数据的插入已成功完成。
C1 verb /ɪmˈpɛər/

impair

损害
Meaning
to weaken or damage something, especially a function or ability
Example
Smoking can impair your lung capacity.
吸烟可能会损害您的肺部容量。
C1 adjective /ɪˈnɒkjuəs/

innocuous

无害的
Meaning
Not harmful or offensive.
Example
His remark was completely innocuous and not meant to offend anyone.
他的评论完全无害，并且没有冒犯任何人的意思。
C1 noun /ˈɪntərˌluːd/

interlude

插曲
Meaning
A short period of time that comes between two events; an interval.
Example
There was a brief musical interlude between the two acts of the play.
在剧本的两个场景之间有一个简短的音乐插曲。
C1 noun /ˈɪntrɪkəsi/

intricacy

复杂性
Meaning
the quality of being very detailed or complicated
Example
The intricacy of the design impressed everyone.
设计的复杂性给每个人留下了深刻印象。
C1 noun /ˈɪn.trə.vɜːrt/

introvert

内向
Meaning
A person who tends to be shy and prefers spending time alone rather than in groups.
Example
As an introvert, he preferred reading over attending parties.
作为一个内向的人，他更喜欢读书而不是参加派对。
C1 noun /ɪmˈpɛdɪmənt/

impediments

障碍
Meaning
A hindrance or obstruction in doing something; things that prevent progress or achievement.
Example
Economic impediments often hinder social development.
经济障碍常常阻碍社会发展。
C1 adjective /ɪnˈtjuː.ɪ.tɪv/

intuitive

直觉的
Meaning
Based on instinctive understanding rather than reasoning.
Example
The software has an intuitive design that makes it easy to use.
该软件具有直观的设计，使其易于使用。
C1 adjective /ɪmˈprɒbəbl/

improbable

不太可能的
Meaning
Not likely to be true or to happen.
Example
It seems improbable that he will arrive on time.
看起来他准时到达的可能性很小。
C1 adjective /ɪnˈtɛlɪdʒəbl/

intelligible

Meaning
Able to be understood; clear enough to be comprehended.
Example
Her speech was barely intelligible over the noise.
C1 adjective /ˌɪnkənˈsɪdərət/

inconsiderate

不体贴
Meaning
Thoughtless; showing a lack of concern for others.
Example
It was inconsiderate of him to play loud music late at night.
他在深夜播放大声音乐，显得很不体贴。
C1 adjective /ɪˈnɔːrdənət/

inordinate

过度的
Meaning
Excessive or unusually large in degree.
Example
She spent an inordinate amount of time on her phone.
她在手机上花费了过多的时间。
C1 adjective /ɪmˈpɛn.ɪ.trə.bəl/

impenetrable

Meaning
Impossible to pass through or enter; impossible to understand.
Example
The dense forest was nearly impenetrable.
C1 adjective ɪˈluː.sər.i

illusory

虚幻的
Meaning
Based on illusion; not real although seeming to be.
Example
His sense of security was entirely illusory.
他的安全感完全是虚幻的。
C1 adjective /ɪnˈtændʒəbl/

intangible

无形的
Meaning
Unable to be touched or grasped; not having a physical presence.
Example
Trust is an intangible quality in relationships.
信任是关系中一种无形的品质。
C1 noun ˌɪn.tuˈɪʃ.ən

intuition

直觉
Meaning
The ability to understand something immediately, without the need for conscious reasoning.
Example
Her intuition told her something was wrong.
她的直觉告诉她有些不对劲。
C1 adjective ɪnˈsaɪ.sɪv

incisive

尖锐
Meaning
Intelligently analytical and clear-thinking; showing clear thought and good understanding of what is important.
Example
His incisive comments revealed the core issues.
他的尖锐评论揭示了核心问题。
C1 noun /ɪnˈvɜːrʒən/

inversion

倒置
Meaning
A reversal of the normal order, position, or relationship.
Example
In poetry, inversion is often used to create emphasis.
在诗歌中，倒置常用来创造强调。
C1 adjective /aɪˈreɪt/

irate

愤怒的
Meaning
Extremely angry.
Example
The customer became irate after waiting for hours.
顾客在等待了几个小时后变得愤怒。
C1 adjective /ɪnˈdʌktɪv/

inductive

归纳的
Meaning
characterized by the inference of general laws from particular instances; reasoning from specific cases to general principles
Example
The scientist used inductive reasoning to form a hypothesis.
科学家使用归纳推理来形成假设。
C1 noun /ˌɪntərˌɒpərəˈbɪləti/

interoperability

互操作性
Meaning
The ability of computer systems or software to exchange and make use of information.
Example
The interoperability of different software systems ensures seamless workflow.
不同软件系统的互操作性确保了无缝的工作流程。
C1 noun /ɪˌluːmɪˈneɪʃən/

illumination

Meaning
the act of lighting something or making something clear
Example
The street was filled with bright illumination from the lamps.
C1 adjective /ɪnˈhjuːmən/

Inhuman

不人道的
Meaning
lacking human qualities; cruel; brutal; savage
Example
The dictator's inhuman treatment of prisoners shocked the international community.
独裁者对囚犯的非人道待遇震惊了国际社会。
C1 adjective, noun /ˈɪnvəlɪd/ (adjective), /ɪnˈvælɪd/ (noun)

invalid

无效的
Meaning
Not valid; having no force or effect. Also refers to a person too weak or ill to care for themselves.
Example
The court declared the contract invalid.
法院宣布合同无效。
C1 noun /ˌaɪ.diˈɒl.ə.dʒi/

ideology

意识形态
Meaning
A system of ideas and ideals, especially one that forms the basis of economic or political theory and policy.
Example
Democracy is based on the ideology of freedom and equality.
民主基于自由和平等的意识形态。
C1 noun /ɪnˈsek.tɪ.saɪd/

Insecticide

杀虫剂
Meaning
a substance used for killing insects; a chemical pesticide that targets insects
Example
The farmer sprayed insecticide on his crops to protect them from harmful bugs.
农民在作物上喷洒杀虫剂，以保护它们免受有害昆虫的侵害。
C1 verb /ˈɪmprəvaɪz/

improvise

Meaning
To create or perform something spontaneously without preparation.
Example
The actor had to improvise his lines when he forgot the script.
C1 noun /ˈɪnˌmeɪt/

inmate

囚犯
Meaning
a person confined to an institution such as a prison or hospital
Example
The prison has over a thousand inmates.
监狱里有超过一千名囚犯。
C1 verb /ɪnˈsɪnjueɪt/

insinuate

Meaning
To suggest or hint something indirectly and often unpleasantly.
Example
He insinuated that she had lied about her qualifications.
C1 noun /ˌɪntərˈdʒɛkʃən/

interjection

感叹词
Meaning
a word or phrase used to express sudden emotion or reaction, often standing alone
Example
Words like 'wow' and 'ouch' are common interjections in English.
像 '哇' 和 '哎呀' 这样的词是英语中常见的感叹词。
C1 verb /ɪnˈkɜːr/

incur

遭受
Meaning
To bring upon oneself something undesirable, usually as a result of actions.
Example
He incurred a fine for parking in the wrong place.
他因在错误的地方停车而被罚款。
C1 adjective /ˌɪnəˈtɛntɪv/

inattentive

不专心的
Meaning
not paying attention; lacking focus or concentration
Example
The inattentive student missed several important instructions.
那个不专心的学生错过了几条重要指示。
C1 verb /ɪmˈpɛl/

impel

Meaning
to drive, force, or urge someone to do something
Example
Her curiosity impelled her to open the mysterious box.
C1 adjective /ɪˈrɛvərənt/

irreverent

不敬的
Meaning
showing a lack of respect for people or things that are usually respected
Example
The comedian’s irreverent jokes offended some of the audience.
那位喜剧演员的不敬笑话冒犯了一些观众。
C1 adjective /ɪˈrɛfjʊtəbəl/

Irrefutable

不可反驳的
Meaning
impossible to deny or disprove; undeniable
Example
The evidence against him was irrefutable.
对他的证据是不可反驳的。
C1 adverb /ɪnˈdɛfɪnətli/

indefinitely

无限期
Meaning
for an unlimited or unspecified period of time
Example
The project has been postponed indefinitely.
该项目已无限期推迟。
C1 adjective /ˈɪndɪɡoʊ bluː/

Indigo-blue

靛蓝
Meaning
a deep blue color with a purplish tinge
Example
The indigo-blue sky looked magnificent at twilight.
在暮光中，靛蓝色的天空看起来壮丽。
C1 noun/verb /ˈɪmprɪnt/

imprint

印记
Meaning
A mark or impression made by pressure; to establish or fix firmly in someone's mind.
Example
The event left an indelible imprint on the city's history.
这一事件在这座城市的历史上留下了不可磨灭的印记。
C1 adjective /ɪnˈtræk.tə.bəl/

intractable

无法控制
Meaning
Difficult or impossible to manage, control, or solve.
Example
The conflict has become an intractable problem.
冲突已经成为一个无法控制的问题。
C1 noun /ɪˈrɛlɪvənsi/

irrelevancy

无关性
Meaning
the state of being unrelated or unimportant to the matter at hand
Example
The judge dismissed the argument because of its irrelevancy to the case.
法官因该论点与案件无关而将其驳回。
C1 verb /ɪnˈsaɪt/

incite

煽动
Meaning
to provoke; to stir up
Example
His speech incited the crowd to violence.
他的演讲激起了人群的暴力。
C1 adjective /ˌɪnədˈvɜːrtənt/

inadvertent

无意的, 非故意的
Meaning
Not resulting from or achieved through deliberate planning; unintentional.
Example
Her inadvertent mistake caused a delay in the project.
她的无意错误导致了项目的延迟。
C1 adjective /ˈɪnbɔːrn/

Inborn

与生俱来的; 天生的; 内在的
Meaning
existing from birth; natural; inherent
Example
She has an inborn talent for music.
她有天生的音乐才能。
C1 noun /ɪmˈbæl.əns/

Imbalance

不平衡
Meaning
lack of proportion or relation between corresponding things; unequal distribution
Example
The doctor said the patient's dizziness was caused by an inner ear imbalance.
医生说病人的头晕是由内耳不平衡引起的。
C1 noun /ˈaɪsətəʊp/

isotope

同位素
Meaning
Atoms of the same element with equal number of protons but different numbers of neutrons.
Example
Carbon-14 is a radioactive isotope used in dating fossils.
碳-14 是一种放射性同位素，用于化石的年代测定。
C1 noun /ɪnˈkɒmpɪtəns/

incompetence

不称职
Meaning
Lack of ability, skill, or effectiveness in doing something.
Example
The project failed due to the manager’s incompetence.
由于经理的不称职，项目失败了。
C1 adjective /ɪˈmjuː.tə.bəl/

immutable

不变的
Meaning
Unchangeable, permanent, or fixed
Example
The laws of physics are considered immutable.
物理定律被认为是不变的。
C1 adjective /ɪˈrɛvəkəbl/

irrevocable

不可撤销
Meaning
Not able to be revoked, changed, or undone.
Example
She made an irrevocable decision to leave the company.
她做出了一个不可撤销的决定离开公司。
C1 adjective /ɪnˈkɒmp(ə)rəbl/

incomparable

无可比拟
Meaning
Without an equal in quality or excellence; matchless.
Example
The view from the mountain was incomparable.
山顶的景色无可比拟。
C1 adjective, noun /ɪnˈdɪkətɪv/

indicative

指示性
Meaning
Serving as a sign or expression of something; in grammar, a mood used to make factual statements.
Example
His tone was indicative of his frustration.
他的语气表明了他的沮丧。
C1 adjective /ɪnˈveɪsɪv/

invasive

侵入性的
Meaning
Tending to spread harmfully, intruding aggressively, or encroaching beyond proper boundaries.
Example
The doctor explained that the procedure was minimally invasive.
医生解释说，该程序是最小的侵入性。
C1 noun /ɪnˈækjʊrəsi/

inaccuracy

不准确
Meaning
lack of accuracy or precision; an incorrect or wrong detail
Example
The report contained several factual inaccuracies.
这份报告包含了一些不准确之处。
C1 adjective /ˌɪnkənˈsiːvəbl̩/

inconceivable

难以想象
Meaning
Impossible to imagine or believe; beyond comprehension.
Example
It seemed inconceivable that she could finish the marathon after such little training.
在如此少的训练之后，她能够完成马拉松，这简直难以想象。
C1 noun ˌɪnsjʊˈleɪʃən

insulation

绝缘
Meaning
Material used to prevent heat, sound, or electricity from being transmitted from one area to another.
Example
Insulation of food storage areas can prevent pests from entering.
食品储存区的绝缘可以防止害虫进入。
C1 adverb /ˈɪnwərdli/

inwardly

内心
Meaning
In the mind or spirit; not outwardly visible.
Example
She smiled outwardly but inwardly she was worried.
她外表微笑，但内心却感到担忧。
C1 verb /ɪnˈhɪbɪt/

inhibit

抑制
Meaning
to prevent or restrain someone or something from acting freely; to hinder
Example
Fear can inhibit personal growth.
恐惧可能会抑制个人成长。
C1 noun /ˌɪnfɪˈdɛləti/

infidelity

不忠
Meaning
the act of being unfaithful to a spouse or partner
Example
Their marriage ended due to his infidelity.
他们的婚姻因他的不忠而结束。
C1 adjective /ˌɪnkəmˈpætəbl/

incompatible

不兼容
Meaning
Not able to exist or work together without conflict.
Example
Their personalities were completely incompatible.
他们的个性完全不兼容。
C1 verb /ɪnˈkɑːrsəreɪt/

incarcerate

监禁
Meaning
to imprison or confine someone
Example
The authorities incarcerated the criminal after the trial.
当局在审判后将罪犯监禁。
C1 adjective ˈɪn.tər.ɪm

interim

临时
Meaning
In or for the intervening period; provisional or temporary.
Example
Interim governments manage transitional phases.
临时政府管理过渡阶段。
C1 noun /ˌɪməˈtjʊərəti/

immaturity

不成熟
Meaning
the state of not being fully developed emotionally, mentally, or physically; lack of maturity
Example
His immaturity made it difficult for him to handle responsibility.
他的不成熟让他难以承担责任。
C1 noun /ˌɪnˈdɪsəplɪn/

indiscipline

缺乏纪律
Meaning
lack of discipline or self-control; failure to obey rules or maintain order
Example
Indiscipline among the students disrupted the learning environment.
学生的缺乏纪律破坏了学习环境。
C1 noun ˌɪn.ɪˈfɪʃ.ən.si

inefficiency

低效率
Meaning
The state or quality of not achieving maximum productivity; failure to make the best use of time or resources.
Example
Government inefficiency leads to slow project completion.
政府低效率导致项目完成缓慢。
C1 noun /ɪnˈdjuːsmənt/

inducement

诱因
Meaning
something that persuades or encourages someone to do something
Example
The company offered a bonus as an inducement to employees.
公司提供了奖金作为员工的诱因。
C1 adjective /ɪˈniː.bri.eɪ.tɪd/

inebriated

醉酒
Meaning
under the influence of alcohol; drunk
Example
He stumbled into the room completely inebriated.
他完全醉了，踉跄地走进了房间。
C1 adjective ˌɪn.təˈdɪs.ɪ.plɪ.nər.i

interdisciplinary

跨学科的
Meaning
Relating to more than one branch of knowledge.
Example
The interdisciplinary approach in education enhances problem-solving skills.
教育中的跨学科方法提高了解决问题的能力。
C1 noun /ˌɪntəkəˈnɛktɪvɪti/

interconnectivity

互联互通
Meaning
The state of being interconnected or the degree of connectivity between components
Example
The rise of interconnectivity has transformed global communication.
互联互通的兴起已经改变了全球通信。
C1 verb /ɪɡˈnaɪt/

ignite

点燃
Meaning
To catch fire or cause to catch fire; to start or arouse.
Example
The sparks ignited the dry leaves in seconds.
火花在几秒钟内点燃了干叶。
C1 noun /ˈɪnkwest/

inquest

调查
Meaning
A legal or official inquiry, especially into the cause of a death.
Example
The inquest revealed the cause of the accident.
调查揭示了事故的原因。
C1 verb /ɪnˈterəˌɡeɪt/

interrogate

审问
Meaning
to ask someone questions in a thorough and formal way; to question intensively
Example
The police interrogated the suspect for hours.
警察审问嫌疑人几个小时。
C1 adjective /ˈaɪərnˌklæd/

ironclad

铁定的
Meaning
impossible to change, break, or dispute; very strong and firm
Example
The company had an ironclad contract with its suppliers.
公司与其供应商签订了铁定合同。
C1 adjective /ɪnˈseɪʃəbl̩/

insatiable

不可满足的
Meaning
impossible to satisfy; always wanting more
Example
Her insatiable curiosity drove her to read every book in the library.
她那不可满足的好奇心促使她阅读了图书馆里的所有书籍。
C1 adjective /ɪnˈdʌldʒənt/

indulgent

宽容的
Meaning
Having a tendency to be overly generous or lenient with someone.
Example
The indulgent mother allowed her child to stay up late.
宽容的母亲让孩子晚点才睡。
C1 adjective /ɪnˈfleɪtɪd/

inflated

膨胀
Meaning
excessively increased in size, value, or importance; filled with air or gas
Example
The company faced criticism for its inflated prices.
公司因其膨胀的价格而遭受批评。
C1 noun /ˈɪnstɪˌɡeɪtər/

instigator

煽动者
Meaning
A person who brings about or initiates something, usually something bad.
Example
The police identified him as the instigator of the violence.
警方将他定为暴力的煽动者。
C1 adjective /ɪnˈdefɪnət/

Indefinite

不确定的
Meaning
not clearly defined; uncertain; vague; unlimited in time
Example
The meeting has been postponed for an indefinite period.
会议被推迟到一个不确定的时期。
C1 adjective /ɪnˈdʌstriəs/

industrious

勤奋的
Meaning
Hardworking and diligent in one's duties.
Example
She is an industrious student who always completes her assignments on time.
她是一个勤奋的学生，总是按时完成她的作业。
C1 adjective /ˈɪnfəməs/

infamous

臭名昭著
Meaning
well known for some bad quality or deed
Example
The dictator was infamous for his cruelty.
这位独裁者因其残忍而臭名昭著。
C1 adjective /ɪnˈɔːdəbl/

inaudible

听不见的
Meaning
Unable to be heard.
Example
Her voice was almost inaudible over the noise.
她的声音几乎在噪音中听不见。
C1 adjective /ɪmˈprɒmp.tjuː/

impromptu

即兴
Meaning
Done without being planned, organized, or rehearsed; spontaneous.
Example
He gave an impromptu speech at the event.
他在活动中做了即兴演讲。
C1 noun /ˈɪrɪtənt/

irritant

刺激物
Meaning
something that causes irritation or discomfort
Example
Dust is a common irritant for people with allergies.
灰尘是过敏者常见的刺激物。
C1 noun /ɪnˌtɪmɪˈdeɪʃən/

intimidation

威胁
Meaning
The action of frightening or threatening someone to make them do something.
Example
The workers reported cases of intimidation by the management.
工人报告了管理层威胁的案例。
C1 verb /ɪnˈfjuːz/

infuse

Meaning
to fill or spread through something; to instill a quality, idea, or feeling
Example
The teacher tried to infuse her students with a love for reading.
C1 adjective /ɪnˈdiːsənt/

indecent

不雅的
Meaning
not conforming to accepted standards of behavior or morality; improper or offensive
Example
He was warned for making an indecent remark during the meeting.
他因为说了不雅的话而受到警告。
C1 noun /ɪnˈkɜːrʒən/

incursion

入侵
Meaning
A sudden attack or invasion into a place or territory.
Example
The army repelled the enemy incursion at the border.
军队在边境击退了敌人的入侵。
C1 adjective /ˌɪrɪˈvɜːrsəbl/

irreversible

不可逆的
Meaning
Not able to be undone, changed, or reversed.
Example
The damage caused by the fire was irreversible.
火灾造成的损失是不可逆的。
C1 adjective /ɪmˈplɔːzəbl/

implausible

不可信
Meaning
Not seeming reasonable or probable; unlikely to be true.
Example
The story she told was so implausible that no one believed her.
她讲的故事太不可信，以至于没有人相信她。
C1 noun ˌɪnfrəˈstrʌktʃərəl dɪˈveləpmənt

infrastructural development

基础设施发展
Meaning
The process of building and improving the basic physical and organizational structures and facilities needed for the operation of a society or enterprise.
Example
Infrastructural development is necessary for efficient recycling.
基础设施发展对高效的回收至关重要。
C1 noun /ɪˌreɡjəˈlærɪti/

irregularity

不规则性
Meaning
lack of regularity or consistency; a deviation from what is normal, expected, or orderly
Example
The audit revealed several financial irregularities in the company’s records.
审计发现该公司的记录中存在多项财务不规则性。
C1 adjective /ɪnˈflɛksəbl/

inflexible

不灵活
Meaning
Not able to bend or change; unwilling to change ideas or behavior.
Example
His inflexible attitude made negotiations difficult.
他那不灵活的态度使谈判变得困难。
C1 adjective /ɪnˈedəbəl/

Inedible

不可食用
Meaning
not suitable or safe for eating; not edible
Example
The mushrooms were poisonous and completely inedible.
蘑菇是有毒的，完全不可食用。
C1 adjective /ɪnˈkɒmpɪtənt/

incompetent

Meaning
Lacking the necessary ability or skills to do something successfully.
Example
He was fired because he was incompetent at his job.