investiture
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C2 noun /ɪnˈvɛstɪtʃər/

investiture

授职仪式
Meaning
the formal ceremony of conferring authority, rank, or office
Example
The king held an investiture ceremony for the new knight.
国王为新骑士举行了授职仪式。
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。
A2 noun /ˈɪn.sekt/

Insect

昆虫
Meaning
a small invertebrate animal with six legs and usually one or two pairs of wings
Example
The butterfly is a beautiful insect that flies from flower to flower.
蝴蝶是一种美丽的昆虫，它从一朵花飞到另一朵花。
A1 noun /ˌɪnfərˈmeɪʃən/

information

信息
Meaning
Facts or knowledge provided or learned about something.
Example
The website provides useful information about travel destinations.
该网站提供有关旅游目的地的有用信息。
B1 verb /ˌɪntərˈækt/

interact

互动
Meaning
to communicate or work together with someone or something
Example
Students interact with teachers during class discussions.
学生们在课堂讨论中与老师互动。
C1 noun ˌɪn.fɪlˈtreɪ.ʃən

infiltration

渗透，秘密进入
Meaning
The process of entering or gaining access to an organization or place surreptitiously.
Example
Cybersecurity prevents infiltration into sensitive data.
网络安全防止了对敏感数据的渗透。
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 /ɪnˈvɪɡ.ər.eɪt/

invigorate

振奋
Meaning
To give strength or energy to someone or something.
Example
A morning walk can invigorate both body and mind.
晨跑可以振奋身心。
C2 adjective /ɪmˈpruːdənt/

imprudent

鲁莽
Meaning
Not showing care for the consequences of an action.
Example
It was imprudent to drive in such stormy weather.
在如此暴风雨的天气下开车是鲁莽的。
C2 noun /ˌɪnkəˈpæsəti/

incapacity

无能
Meaning
the lack of ability, power, or fitness to do something
Example
His mental incapacity prevented him from making important decisions.
他的心理无能使他无法做出重要决策。
C1 adjective /ˌaɪ.di.əˈlɒdʒ.ɪ.kəl/

ideological

意识形态的
Meaning
Relating to or based on a system of ideas or beliefs.
Example
The two parties are divided by deep ideological differences.
这两个党派由于深刻的意识形态分歧而分裂。
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。
C2 noun /ɪnˈtɛstəsi/

intestacy

无遗嘱的死亡
Meaning
The condition of dying without having made a valid will.
Example
His estate was divided according to the laws of intestacy.
他的财产根据无遗嘱的法律被分配。
C2 noun /ɪnˈtɛnʃən/

intension

内涵
Meaning
The internal content of a concept; the set of attributes implied by a word or phrase.
Example
The intension of the word 'dog' includes being a mammal and domesticated.
'狗'这个词的内涵包括是哺乳动物和被驯养。
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。
C2 noun /ˌɪn.strəˈmɛn.təl.ɪst/

instrumentalist

乐器演奏者
Meaning
A person who plays a musical instrument.
Example
The instrumentalist played a beautiful solo on the violin.
乐器演奏者在小提琴上演奏了一首美丽的独奏曲。
C2 noun /ˈɪndɪkənt/

indicant

指示物
Meaning
Something that indicates or points to a fact or condition.
Example
High fever is often an indicant of infection.
高烧通常是感染的指示物。
A2 adjective/noun /ˈɪndiən/

indian

印度的
Meaning
Relating to India, its people, or their culture.
Example
She loves Indian food, especially biryani.
她喜欢印度食物，特别是比尔亚尼。
C2 noun /ɪnˈfriːkwəns/

infrequence

罕见性
Meaning
The state of occurring rarely or at long intervals.
Example
The infrequence of their meetings made it hard to maintain close ties.
他们会议的罕见性使得保持亲密关系变得困难。
A2 noun /ɪmˈpɔːtəns/

importance

重要性
Meaning
The quality or state of being important; consequence or significance.
Example
The importance of time management cannot be overstated.
时间管理的重要性无法被夸大。
C2 noun /ˌɪnˌkeɪpəˈbɪləti/

incapability

无能力
Meaning
lack of ability or power to do something; inability or incompetence
Example
His incapability to manage the team led to serious problems.
他管理团队的无能力导致了严重的问题。
C2 verb /ɪnˈɡreɪʃiˌeɪt/

ingratiate

Meaning
To gain favor or approval by deliberate effort, often in a flattering way.
Example
She tried to ingratiate herself with her boss by complimenting him often.
C1 verb /ˈaɪdəlaɪz/

idolize

偶像崇拜
Meaning
To admire or worship someone excessively.
Example
Fans often idolize celebrities for their talent and lifestyle.
粉丝们常常因为他们的才华和生活方式而崇拜名人。
C2 noun /ɪˌledʒ.əˈbɪl.ə.ti/

Illegibility

难以辨认
Meaning
the quality of being impossible or difficult to read; unclear writing or print
Example
The doctor's handwriting was famous for its illegibility among the pharmacy staff.
医生的字迹因其难以辨认而在药房工作人员中广为人知。
B1 verb /ˈɪndɪkeɪt/

indicate

指示
Meaning
to point out; to show or suggest; to be a sign of
Example
The red light indicates that you should stop.
红灯表示你应该停下来。
C2 verb /ɪmˈpɛnd/

impend

临近
Meaning
to be about to happen; to loom threateningly
Example
Dark clouds suggested that a storm was impeding.
乌云暗示着暴风雨即将来临。
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 adjective /ɪnˈsɒlvənt/

insolvent

破产
Meaning
unable to pay debts owed
Example
The insolvent firm could not meet its financial obligations.
破产公司无法履行其财务义务。
C1 noun /ɪnˈfɜːməri/

infirmary

医务室
Meaning
A hospital or place where the sick or injured are cared for.
Example
The school had an infirmary for minor injuries.
学校为轻微受伤提供了医务室。
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。
B2 noun /ɪmˈpɒlɪtnəs/

impoliteness

不礼貌
Meaning
lack of good manners or courtesy; rude behavior
Example
His impoliteness towards the guests shocked everyone.
他对客人的不礼貌让所有人都感到震惊。
A1 noun /ˈaɪs kriːm/

Ice-cream

冰淇淋
Meaning
a frozen sweet dessert made from dairy products, usually served cold
Example
Children love to eat ice-cream on hot summer days.
孩子们喜欢在炎热的夏季日子里吃冰淇淋。
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。
A2 verb /ɪnˈkri:s/

increase

增加
Meaning
to become or make something larger in amount, number, or degree
Example
The company plans to increase its production this year.
公司计划在今年增加生产。
C1 adjective /ɪnˈkɒŋɡruəs/

incongruous

不一致
Meaning
Not fitting in with or suitable for the surroundings.
Example
His jokes were incongruous during the serious meeting.
他的笑话在严肃的会议中显得不一致。
C2 adjective /ɪnˈsuːsiənt/

insouciant

无忧无虑
Meaning
Showing a casual lack of concern; carefree.
Example
He gave an insouciant shrug and walked away.
他无忧无虑地耸了耸肩，然后走开了。
A1 noun /ˈɪntənet/

internet

全球计算机网络
Meaning
A global computer network providing a variety of information and communication facilities.
Example
The internet has revolutionized the way we access information.
互联网彻底改变了我们获取信息的方式。
C2 noun /ˈɪntərˌloʊpər/

interloper

闯入者
Meaning
A person who becomes involved in a situation or place where they are not wanted.
Example
He felt like an interloper at the private family gathering.
他在私人家庭聚会中感到像一个闯入者。
C1 noun /ˌɪnkoʊˈhɪrəns/

incoherence

不一致
Meaning
The quality of being unclear, confused, or lacking logical connection.
Example
His speech was full of incoherence and difficult to follow.
他的演讲充满了不一致，难以跟随。
B2 verb /ɪnˈdʒɛkt/

inject

注射
Meaning
To introduce a substance, especially a drug, into the body using a needle.
Example
The nurse will inject the vaccine into the patient's arm.
护士将疫苗注射到病人的手臂中。
C2 adjective /ˌɪrɪˈkɒnsɪləbl/

irreconcilable

不可调和的
Meaning
impossible to make compatible or bring into harmony; unable to resolve differences
Example
The couple separated due to irreconcilable differences.
这对夫妇因不可调和的分歧而分开。
C2 adjective /ɪˈnɪm.ɪ.tə.bəl/

inimitable

无可比拟
Meaning
So good or unusual as to be impossible to copy; unique.
Example
His inimitable writing style made him a literary legend.
他那无可比拟的写作风格使他成为了文学传奇。
B2 verb ˈɪmplɪmentɪd

implemented

实施
Meaning
Put a decision or plan into effect; carried out or executed.
Example
The master plans were partially implemented.
主要计划已部分实施。
C1 adjective /ˈɜːrksəm/

irksome

恼人的
Meaning
annoying or irritating
Example
Waiting in a long line is one of the most irksome tasks.
在长队中等待是最让人恼火的任务之一。
C1 adjective ˌɪn.təˈmɪt.ənt

intermittent

间歇的
Meaning
Happening irregularly, not continuously.
Example
The rain was intermittent throughout the day.
雨整天都间歇不断。
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 /ɪˈmoʊbəl/

immobile

无法移动
Meaning
unable to move or be moved
Example
After the accident, he was immobile for weeks.
事故发生后，他几周都无法移动。
A2 noun /ˈɪnfoʊ/

info

信息
Meaning
information; knowledge or facts about something or someone
Example
She gave me all the info I needed for the meeting.
她给了我所有会议所需的信息。
B1 adjective /ɪmˈpruːvd/

improved

改进的
Meaning
made better or enhanced in quality or condition
Example
Her health has significantly improved since last month.
她的健康自上个月以来显著改善。
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。
C2 adjective /ɪˈnɪmɪkəl/

inimical

敌对的 / 不利的
Meaning
tending to obstruct or harm; unfriendly or hostile
Example
The policy was inimical to the country's economic growth.
该政策对该国的经济增长不利。
B2 adjective /ˌɪd.iˈɒt.ɪk/

Idiotic

愚蠢
Meaning
extremely stupid; foolish; senseless
Example
His idiotic behavior embarrassed everyone at the meeting.
他的愚蠢行为让会议上的所有人感到尴尬。
C1 adjective /ˈɪɡ.ni.əs/

igneous

火成
Meaning
Formed through the cooling and solidification of magma or lava.
Example
Granite is an igneous rock commonly used in construction.
花岗岩是一种常用于建筑的火成岩。
C1 adjective /ˌɪndɪˈskriːt/

indiscreet

不谨慎
Meaning
Not careful in what one says or does, likely to reveal secrets or offend.
Example
It was indiscreet of him to mention the plan in public.
他在公众场合提到计划是不谨慎的。
C1 noun /ɪnˈtɛstɪn/

intestine

肠
Meaning
The part of the digestive system where food is digested and absorbed, extending from the stomach to the anus.
Example
The doctor explained how nutrients are absorbed in the small intestine.
医生解释了营养物质如何在小肠中被吸收。
A2 noun/adjective /ˌɪndɪˈvɪdʒuəl/

individual

个体
Meaning
A single human being as distinct from a group; relating to one person.
Example
Each individual has the right to freedom of speech.
每个个体都有言论自由的权利。
C2 noun /ˌɪnvəˈluːʃən/

involution

内卷
Meaning
a complicated or intricate form or state; in biology, the shrinking of an organ after its function has finished
Example
The story was full of involution, making it hard to follow.
这个故事充满了内卷，使得跟随它变得很难。
B2 adjective /ˌɪnkənˈsɪstənt/

inconsistent

不一致
Meaning
Not staying the same throughout; lacking harmony or regularity.
Example
His answers were inconsistent and confusing.
他的回答不一致且令人困惑。
B1 verb /ɪnˈvɛnt/

invent

发明
Meaning
to create or design something that has not existed before
Example
Thomas Edison invented the electric bulb.
托马斯·爱迪生发明了电灯泡。
C2 noun /ɪnˈvaɪtər/

invitor

邀请者
Meaning
a person who invites someone to an event, meeting, or place
Example
The invitor greeted all the guests warmly at the entrance.
邀请者在入口处热情地欢迎了客人。
C1 verb /ɪnˈdʌkt/

induct

Meaning
to formally admit someone into a position, organization, or office
Example
She was inducted into the university's honor society.
C1 verb /ˌɪntərˈsɛpt/

intercept

Meaning
to stop, catch, or seize something on its way from one place to another
Example
The police intercepted the stolen car before it crossed the border.
C1 verb /ɪnˈfɛst/

infest

感染
Meaning
to overrun in large numbers, especially so as to cause damage or discomfort
Example
The old house was infested with rats.
老房子被老鼠感染。
C2 verb /ɪˈnjʊər/

inure

习惯
Meaning
To become accustomed to something, especially something unpleasant.
Example
Soldiers quickly became inured to the harsh conditions.
士兵们迅速适应了严酷的条件。
C2 adjective /ɪˈnɪkwɪtəs/

iniquitous

不公正
Meaning
grossly unfair and morally wrong
Example
Slavery was one of the most iniquitous practices in history.
奴隶制是历史上最不公正的实践之一。
B2 verb /ɪnˈheɪl/

inhale

吸气
Meaning
to breathe in; to draw air into the lungs
Example
Take a deep breath and inhale slowly.
深吸一口气并缓慢地吸入。
C1 adjective ˌɪn.krəˈmen.təl

incremental

增量
Meaning
Relating to or denoting an increase or addition, especially one of a series on a fixed scale; proceeding in small stages.
Example
Incremental changes ensure sustainability.
增量变化确保可持续性。
C1 verb ɪˈnɪʃɪeɪtɪd

initiated

启动
Meaning
Caused a process or action to begin; started something.
Example
The project was initiated to enhance marine biodiversity.
该项目已启动以促进海洋生物多样性。
C1 adjective /ˌɪnɔːrˈɡænɪk/

inorganic

无机的
Meaning
relating to substances that are not derived from living organisms; lacking organic structure or growth
Example
Inorganic compounds are commonly studied in chemistry labs.
无机化合物是化学的重要部分。
C2 verb /ɪnˈhjuːm/

inhume

埋葬
Meaning
to bury a dead body in the ground
Example
They inhumed the warrior with full honors.
他们用全部荣誉埋葬了战士。
B1 verb ˈɪndɪkeɪts

indicates

表示
Meaning
Point out; show; be a sign or symptom of; suggest as a desirable or necessary course of action.
Example
The rising trend indicates an urgent need for action.
上升的趋势表示迫切需要采取行动。
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。
C2 noun /ˌɪnvəˈkeɪʃən/

invocation

祈求
Meaning
the act of calling upon a higher power for help, blessing, or inspiration
Example
The ceremony began with an invocation to the gods.
仪式以对神的祈求开始。
C2 noun /ɪmˈpjuːnɪti/

impunity

Meaning
freedom from punishment or harmful consequences for an action
Example
The dictator ruled with impunity, ignoring international laws.
C2 verb /ˌɪmpɔːrˈtuːn/

importune

反复请求
Meaning
To ask someone persistently or pressingly for something
Example
The child importuned his mother for a new toy.
孩子反复请求母亲给他买一个新玩具。
B2 noun /ɪnˈventər/

inventor

发明家
Meaning
a person who creates or designs something new, especially a device, method, or process
Example
The inventor patented her new medical device.
这位发明家为她的新医疗设备申请了专利。
B2 noun /ɪnˈveɪʒən/

invasion

入侵
Meaning
An instance of invading a country, region, or personal space with armed force or unwelcome presence.
Example
The army prepared for the possibility of an invasion.
军队为可能的入侵做了准备。
B2 noun /ɪnˈspɛktər/

inspector

检查员
Meaning
An official employed to ensure regulations are obeyed or standards are met.
Example
The inspector carefully checked the restaurant's kitchen for hygiene standards.
检查员仔细检查了餐厅的厨房是否符合卫生标准。
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 adjective /ɪˈnɜːrt/

inert

惰性
Meaning
lacking the ability or strength to move or act; chemically inactive
Example
The patient remained inert on the bed.
病人躺在床上保持不动。
C2 noun /ɪnˈsɪpiəns/

incipience

开始
Meaning
the beginning or initial stage of something
Example
The project was still in its incipience when funding was approved.
当资金获得批准时，项目仍处于其开始阶段。
C1 noun /ˌɪnækˈtɪvɪti/

inactivity

不活动
Meaning
the state of not being active physically or mentally; lack of action
Example
Prolonged inactivity can negatively affect both physical and mental health.
长期不活动会对身体和心理健康产生负面影响。
C1 adjective /ˌɪn.ɪˈfɛk.tʃu.əl/

ineffectual

无效
Meaning
Not producing any or the desired effect; lacking the ability or qualities to achieve a purpose.
Example
The manager’s ineffectual leadership caused the team to lose motivation.
经理无效的领导导致团队失去了动力。
A2 adjective ˌɪn.təˈnæʃ.ən.əl

international

国际的
Meaning
Existing, occurring, or carried on between two or more nations and their citizens.
Example
International standards improve competitiveness.
国际标准提高竞争力。
C1 adjective /ˌɪnkɒmprɪˈhɛnsəbl/

incomprehensible

难以理解的
Meaning
Impossible or very difficult to understand.
Example
The professor’s lecture was so fast it became incomprehensible.
教授的讲座太快了，以至于变得难以理解。
C1 adjective /ˌɪnkəʊˈhɪərənt/

incoherent

不连贯
Meaning
Not clear or easy to understand; lacking logical connection.
Example
His explanation was so incoherent that nobody could follow it.
他的解释如此不连贯，以至于没有人能理解。
C2 noun /ɪkˈsɔːr.ə/

Ixora

伊克索拉
Meaning
a tropical flowering shrub with clusters of small bright red, orange, or yellow flowers
Example
The bright red ixora bushes lined the pathway to the tropical garden.
亮红色的伊克索拉灌木排成行，沿着通往热带花园的小径。
C2 adjective /ɪmˈplækəbl/

implacable

不可调和
Meaning
unable to be appeased, calmed, or pacified
Example
The soldiers faced an implacable enemy who refused to surrender.
士兵们面对着一个不可调和的敌人，他拒绝投降。
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。
C2 noun /ɪˈrɛvərəns/

irreverence

不敬
Meaning
a lack of respect for people or things that are generally taken seriously
Example
His jokes about religion showed irreverence to the sacred traditions.
他关于宗教的笑话表现了对神圣传统的不敬。
B1 verb /ɪnˈstɔːl/

install

安装
Meaning
To place or fix equipment or software so it is ready for use.
Example
He installed the new software on his computer.
他在他的电脑上安装了新软件。
C1 noun /ˌɪntərˈmɪʃən/

intermission

中场休息
Meaning
A pause or break, especially during a performance or event.
Example
The play had a twenty-minute intermission.
话剧有二十分钟的中场休息。
C1 adjective /ˌɪndɪˈspjuːtəbəl/

Indisputable

不可争辩的; 不容否认的; 确定的
Meaning
impossible to deny or argue against; undeniable; certain
Example
The evidence against him was indisputable.
反对他的证据是不可争辩的。
C2 noun /ˌɪnkrɪˈdjuːləti/

incredulity

怀疑
Meaning
the state of being unwilling or unable to believe something
Example
She looked at him with incredulity after hearing the strange story.
在听到那个奇怪的故事后，她带着怀疑看着他。
A2 adjective/noun /ˈaɪrɪʃ/

irish

幸福
Meaning
relating to Ireland, its people, or its language
Example
The Irish countryside is very beautiful.
当她收到奖项时，她无法隐藏自己的幸福。
B1 adjective /ˈɪnər/

inner

内在的
Meaning
Located inside or closer to the center; relating to one’s thoughts or feelings.
Example
She shared her inner thoughts with her best friend.
她与她最好的朋友分享了她的内心想法。
B2 adjective /ɪnˈkluːsɪv/

inclusive

包容的
Meaning
Including all the services, facilities, or items normally expected or required; not excluding any section of society or any party involved.
Example
Inclusive growth benefits all sections of society.
包容性增长惠及社会的所有阶层。
B1 adjective /ɪmˈpres.ɪv/

Impressive

令人印象深刻的
Meaning
striking; remarkable; having the ability to impress
Example
Her impressive performance earned her a standing ovation.
她出色的表演赢得了全场起立鼓掌。
C2 verb /ɪnˈɡrɑːft/

ingraft

根植
Meaning
To implant or fix deeply, often used in the sense of grafting an idea or quality.
Example
The teacher tried to ingraft good manners in the students.
老师尝试将良好的行为习惯根植于学生们。
C2 noun /ˌɪn.ɪˈbraɪ.ə.ti/

inebriety

醉酒
Meaning
the state of being drunk or intoxicated
Example
His frequent inebriety led to the loss of his job.
他的频繁醉酒导致了他失去工作。
C1 adjective ɪnˈdʒiː.ni.əs

ingenious

巧妙
Meaning
Showing inventiveness and skill; clever, original, and inventive.
Example
His ingenious ideas transformed modern physics.
他的巧妙想法改变了现代物理学。
B2 adjective /ɪnˈseɪn/

insane

疯狂
Meaning
mentally ill; extremely foolish or unreasonable
Example
The idea of jumping off the cliff seemed insane.
从悬崖上跳下的想法显得疯狂。
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。
B1 adjective ˈɪnəveɪtɪv

innovative

创新的
Meaning
Featuring new methods; advanced and original
Example
Innovative strategies are required to combat pollution.
创新的战略是解决污染问题的关键。
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 /ˈɪrɪtəbl/

irritable

Meaning
easily annoyed or made angry
Example
She became irritable after working long hours without rest.
C2 noun /ɪnˈsuːsiəns/

insouciance

无忧无虑
Meaning
Casual lack of concern; indifference.
Example
She carried herself with an air of insouciance, unbothered by the challenges ahead.
她带着一副无忧无虑的样子走着，毫不担心前方的挑战。
C1 adjective /ˌɪnəˈfɛnsɪv/

inoffensive

无害的
Meaning
Not likely to offend or provoke; harmless.
Example
His inoffensive remarks kept the conversation friendly.
他的无害评论让谈话保持友好。
C2 verb /ˈɪndjʊˌreɪt/

indurate

使坚硬
Meaning
To harden or make something physically or emotionally tough.
Example
Years of hardship indurated his spirit.
多年的艰辛使他的精神变得坚韧。
B2 noun, verb /ˈɪnstɪˌtjuːt/

institute

学院
Meaning
as a noun, an organization founded for a specific purpose; as a verb, to establish or initiate
Example
The university decided to institute new rules for the library.
大学决定为图书馆制定新规则。
C1 noun /ˈɪnflʌks/

influx

涌入
Meaning
A large arrival or flow of people or things.
Example
The city experienced an influx of tourists during the festival.
这座城市在节日期间经历了大量游客的涌入。
A1 adjective /ɪmˈpɔː.tənt/

important

重要
Meaning
Of great significance or value; likely to have a profound effect on success, survival, or well-being.
Example
Important steps must be taken to address pollution.
必须采取重要步骤来解决污染问题。
C1 adjective ˌɪm.pəˈsɛp.tɪ.bəl

imperceptible

无法察觉的
Meaning
So subtle or gradual that it is difficult to notice or perceive
Example
The changes in his behavior were imperceptible at first.
他行为中的变化一开始几乎是无法察觉的。
C2 adjective /ˌɪndɪˈsɒljʊbl/

indissoluble

不可分割的
Meaning
Unable to be destroyed, broken, or dissolved.
Example
Marriage was once considered an indissoluble bond.
婚姻曾被视为不可分割的纽带。
C1 adjective ɪnˈtrɪn.zɪk

intrinsic

内在的, 本质的, 自然的
Meaning
Belonging naturally; essential. Existing as a natural or basic part of something.
Example
Creativity is an intrinsic quality of a great artist.
创造力是伟大艺术家的内在品质。
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。
B1 adverb /ɪnˈkrɛdɪbli/

incredibly

难以置信地
Meaning
to a great degree; extremely or unbelievably
Example
The view from the top of the mountain was incredibly beautiful.
从山顶看到的景色是难以置信地美丽。
B1 noun /ˈɪnsɪdənt/

incident

事件
Meaning
an event or occurrence, often unpleasant or unusual
Example
The police quickly responded to the incident in the park.
警方迅速回应了公园内的事件。
C2 adjective /ɪˈræsɪbl/

irascible

易怒的
Meaning
Easily angered; quick-tempered.
Example
His irascible nature often got him into trouble.
他易怒的性格常常使他陷入麻烦。
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。
B1 noun ɪnˈvestmənt

investment

投资
Meaning
The action or process of investing money for profit or material result.
Example
Investment in waste management infrastructure is essential.
废物管理基础设施的投资至关重要。