B2 adjective /ʌnˈfɪt/

Unfit

不适合; 不适当;

Meaning

not in good physical condition; unsuitable or inappropriate

Example

He was declared unfit for military service due to his poor health.

由于健康状况差，他被宣判不适合军事服务。

C2 noun /ˈʌn.dɚˌstɔː.ri/

understory

下层植被

Meaning

The layer of vegetation beneath the main canopy of a forest.

Example

The understory of a rainforest is home to small mammals and insects.

雨林的下层植被是小型哺乳动物和昆虫的家园。

C1 adjective /ʌlˈtɪəriər/

ulterior

隐藏的动机

Meaning

hidden or secret, often with a selfish motive

Example

He invited her with an ulterior motive.

他带着隐藏的动机邀请了她。

B1 adjective /ʌnˈʃʊr/

unsure

不确定的

Meaning

not certain or confident; feeling doubt

Example

She felt unsure about the decision.

她对这个决定感到不确定。

C1 adjective /ˌʌnprɪˈtɛnʃəs/

unpretentious

谦虚的

Meaning

modest; not attempting to impress others with appearance or importance

Example

She lives in an unpretentious home but is very happy.

她住在一个谦虚的家里，但非常快乐。

C1 verb /ˌʌndərˈsteɪt/

understate

低估

Meaning

To describe something as being less important or serious than it really is.

Example

He tends to understate his achievements.

他倾向于低估自己的成就。

C2 adjective /ˌʌltrəˈmʌndeɪn/

ultramundane

超凡

Meaning

Relating to things beyond the physical world; supernatural or transcendental.

Example

Philosophers often discuss ultramundane realities beyond human perception.

哲学家们常常讨论超越人类感知的超凡现实。

B2 adjective /ˌʌnrɪˈlaɪəbl/

Unreliable

不可靠的; 不能被信任或依赖

Meaning

not dependable; not able to be trusted or relied upon

Example

The old car is unreliable and breaks down frequently.

这辆老车不可靠，常常坏掉。

B1 adjective /ʌnˈnoʊn/

Unknown

未知

Meaning

not known or identified; unfamiliar

Example

The author of this letter remains unknown.

这封信的作者仍然未知。

C1 adjective /ʌnˈbraɪdld/

unbridled

无法控制的

Meaning

Uncontrolled and unrestrained.

Example

The protesters showed unbridled enthusiasm for change.

抗议者展示了对改变的无法抑制的热情。

C1 adjective /ʌnˈruːli/

Unruly

不守规矩的; 乱七八糟的;

Meaning

difficult to control or manage; disorderly and disruptive

Example

The unruly crowd refused to follow the safety instructions.

那群无法控制的人群拒绝遵循安全指令。

A1 verb /juːz/

use

使用

Meaning

to employ something for a purpose; to take advantage of

Example

I use my computer for work and entertainment.

我用我的计算机来工作和娱乐。

C1 adjective /ʌnˈɒnəd/

unhonoured

未受尊敬的

Meaning

not respected or given the recognition that is deserved; treated without honor

Example

He felt unhonoured after his years of service were ignored.

他的多年服务被忽视后，他感到自己未受尊敬。

A2 verb /ʌpˈdeɪt/

update

更新

Meaning

to make something more modern or current; to provide new information

Example

Please update your software regularly.

请定期更新您的软件。

C1 adjective ʌnˈwɔːr.rən.tɪd

unwarranted

不合理的

Meaning

Not justified or necessary; without good reason.

Example

His anger toward the staff was completely unwarranted.

他对员工的愤怒是完全不合理的。

C2 adjective /ʌnˈɡeɪnli/

ungainly

笨拙

Meaning

Awkward, clumsy, or lacking grace in movement or appearance.

Example

The tall boy moved in an ungainly manner.

那个高个男孩以笨拙的方式走动。

C1 noun /ˈʌp.tɜːn/

upturn

改善

Meaning

An improvement or upward trend in a situation, especially in business or economy.

Example

The company experienced an upturn in sales last quarter.

该公司在上个季度销售情况有所改善。

A2 adjective /ʌnˈtaɪdi/

Untidy

凌乱的; 无序的;

Meaning

not neat or orderly; messy and disorganized

Example

Her untidy room was filled with clothes scattered everywhere.

她凌乱的房间充满了四处散落的衣服。

C2 adjective /ˌʌnpriːpəˈzɛsɪŋ/

unprepossessing

不吸引人

Meaning

not attractive or appealing in appearance

Example

Despite his unprepossessing looks, he was very kind and intelligent.

尽管他的外貌不吸引人，他还是非常友善和聪明。

C1 adjective /ʌnˈmɒdɪfaɪd/

unmodified

未修改的

Meaning

not changed from its original form or state

Example

The data was used in its unmodified form for analysis.

这些数据以未修改的形式用于分析。

B1 preposition, adverb, adjective /ˌʌndərˈniːθ/

underneath

在……下面

Meaning

Located directly below or beneath something

Example

The keys were hidden underneath the pile of papers.

钥匙被隐藏在那堆文件下面。

C1 verb /ˌʌndərˈlaɪ/

underlie

位于...之下

Meaning

to be the hidden cause or basis of something

Example

Strong cultural traditions underlie the community's practices.

强大的文化传统是社区实践的基础。

C1 adjective /ʌnˈtoʊld/

Untold

不可计数的; 无尽的

Meaning

very great in amount or degree; countless; immeasurable

Example

The earthquake caused untold damage to the city.

地震对城市造成了无法计数的损害。

B2 adjective /ʌnˈlɔːfl/

Unlawful

非法; 不合法

Meaning

not authorized by law; illegal

Example

The court declared the search unlawful.

法院宣布搜索是非法的。

C1 adjective ʌnˈpær.ə.leld

Unparalleled

无与伦比

Meaning

Having no equal; unmatched, peerless, and supreme in quality or achievement.

Example

The unparalleled beauty of the Taj Mahal amazes visitors.

泰姬陵无与伦比的美丽使游客惊叹。

B2 adjective /ˌʌnkənˈvɛnʃənl/

unconventional

非传统的

Meaning

not based on or conforming to what is generally done or believed

Example

Her unconventional approach to teaching inspired her students to think creatively.

她非传统的教学方法激发了学生的创造性思维。

B2 verb /ˌʌndərˈskɔːr/

underscore

强调

Meaning

to emphasize or highlight something

Example

The incident underscored the need for better safety measures.

这起事件突显了更好安全措施的必要性。

B2 adjective /ʌnprɪˈpɛrd/

Unprepared

未准备好

Meaning

not ready or able to deal with something

Example

He was unprepared for the difficult exam.

他对困难的考试毫无准备。

C2 adjective /juːˈbɪkwɪtəs/

ubiquitious

无处不在

Meaning

Present, appearing, or found everywhere.

Example

Smartphones have become ubiquitous in modern society.

智能手机已经在现代社会中无处不在。

C1 adjective /ʌnˈspiːkəbl/

unspeakable

难以形容

Meaning

too bad or shocking to be expressed in words

Example

The survivors endured unspeakable horrors during the war.

幸存者在战争中忍受了难以形容的恐怖。

C1 adjective /ˌʌnˈpɑr.də.nə.bəl/

Unpardonable

不可宽恕的

Meaning

too bad to be forgiven; inexcusable

Example

His betrayal of trust was an unpardonable offense.

他的背叛是不可原谅的罪行。

C1 noun /ˈʌndərˌwɜːrld/

underworld

地下世界

Meaning

The criminal world of organized crime or the mythical world of the dead.

Example

The detective spent years studying the secrets of the underworld.

侦探花了很多年研究地下世界的秘密。

A2 noun /ˌʌndərˈstændɪŋ/

understanding

理解

Meaning

the ability to grasp the meaning, significance, or nature of something

Example

Her understanding of the issue was impressive.

她对这个问题的理解令人印象深刻。

C2 noun /ɜːrˈbænɪti/

urbanity

都市气质

Meaning

refined courtesy, elegance, and sophistication in manner

Example

Her urbanity made her popular among diplomats and leaders.

她的都市气质让她在外交官和领导人中非常受欢迎。

C1 adjective /ʌnˈhoʊli/

Unholy

亵渎的; 罪恶的; 亵渎的

Meaning

wicked; sinful; profane

Example

The unholy alliance between the two companies caused public outrage.

这两家公司之间的不圣洁联盟引发了公众愤怒。

B2 adjective /ˈʌt.moʊst/

Utmost

最极; 极限

Meaning

greatest; most extreme; maximum possible

Example

She showed utmost care while handling the fragile items.

她在处理脆弱物品时表现出最大的关心。

B2 verb /ˌʌndərˈmaɪn/

undermine

削弱

Meaning

to gradually weaken or damage something or someone

Example

Constant criticism can undermine a child's confidence.

持续的批评可能会削弱孩子的自信心。

A2 adjective /ʌnˈhel.θi/

Unhealthy

不健康的; 有害的

Meaning

harmful to health; not in good health; detrimental to well-being

Example

Eating too much fast food is unhealthy for your body.

吃太多快餐对你的身体不健康。

C1 noun /ˈʌndərˌɡɑːrmənt/

undergarment

内衣

Meaning

a piece of clothing worn under outer clothes, usually next to the skin

Example

He bought new undergarments for the wedding.

他为婚礼买了新的内衣。

C1 adjective /ˌʌnsəˈfɪstɪˌkeɪtɪd/

unsophisticated

不复杂

Meaning

Lacking worldly experience, refinement, or complexity.

Example

The villagers led an unsophisticated but happy life.

村民过着简单而幸福的生活。

C1 adjective /ʌnˈtɛnəbl/

untenable

无法维持

Meaning

not able to be maintained or defended against attack or objection

Example

The politician resigned when his position became untenable.

政治家在他的立场变得无法维持时辞职。

C1 verb /ʌnˈɜːθ/

unearth

发掘

Meaning

To dig up from the ground or to discover something hidden.

Example

Archaeologists unearthed ancient artifacts at the site.

考古学家在遗址发掘了古代文物。

C1 adjective /ʌnˈtʃælɪndʒd/

Unchallenged

无可争议的; 被接受的没有反对; 没有对手

Meaning

not disputed or questioned; accepted without opposition; having no rival

Example

He remained the unchallenged champion for five years.

他五年保持不败的冠军。

C1 adjective /ʌnˈkleɪmd/

Unclaimed

未认领的; 未要求的; 被遗弃或无主的

Meaning

not claimed by anyone; not demanded or requested; abandoned or ownerless

Example

The unclaimed luggage was stored in the airport's lost property department.

未认领的行李被存放在机场的失物招领处。

B1 verb /juˈnaɪt/

unite

联合

Meaning

to join together or combine; to bring people or things together

Example

The crisis helped unite the community.

危机帮助团结了社区。

B2 adjective /ʌnˈdʒʌst/

Unjust

不公正的; 错误的

Meaning

not fair or right; morally wrong

Example

The punishment was unjust for such a minor offense.

这个惩罚对于如此轻微的罪行来说是不公正的。

B1 adjective /ˌʌnɪkˈspektɪd/

Unexpected

出乎意料的; 令人惊讶的

Meaning

not expected or anticipated; surprising

Example

The unexpected news left everyone speechless.

出乎意料的消息让所有人都哑口无言。

C1 noun /ˈʌndərˌteɪkər/

undertaker

殡葬员

Meaning

A person whose job is to prepare the dead for burial and arrange funerals.

Example

The undertaker prepared the body for the funeral service.

殡葬员为葬礼服务准备了尸体。

C2 noun /ˈʌŋɡwənt/

unguent

药膏

Meaning

A soothing or healing ointment applied to the skin.

Example

The doctor applied an unguent to heal the burn.

医生涂抹了药膏来治愈烧伤。

C1 adjective /ˌʌndərɪkˈspoʊzd/

underexposed

曝光不足，忽视的

Meaning

insufficiently exposed to light (in photography) or not given enough attention

Example

The photo was underexposed and looked too dark.

照片曝光不足，看起来太暗了。

A2 adjective /ʌnˈkʌmf.tə.bəl/

Uncomfortable

不舒服

Meaning

causing or feeling slight pain or physical discomfort; making someone feel embarrassed, awkward, or anxious

Example

The chair was so uncomfortable that I couldn't sit in it for more than ten minutes.

这个椅子太不舒服了，我坐在上面超过十分钟就坐不下来了。

C2 verb /ʌnˈjoʊk/

unyoke

解开

Meaning

To release from a yoke or to free from restraint or obligation.

Example

The farmer unyoked the oxen after a long day of work.

农民在长时间工作后解开了牛的套索。

C2 adjective /ˌʌnəˈʃʊəd/

unassured

不确定的

Meaning

Lacking confidence or certainty.

Example

She gave an unassured answer during the interview.

她在面试中给出了一个不确定的答案。

C1 adjective /ʌnˈwɪtɪŋ/

unwitting

无意的

Meaning

Not aware of what is happening; done without realizing.

Example

She became an unwitting participant in the scam.

她成了这场骗局中的一个无意的参与者。

A2 noun /ˈjuːzər/

user

用户

Meaning

a person who uses or operates something

Example

He is a frequent user of this app.

他是这个应用程序的常用用户。

B2 adjective /ʌnfəˈmɪl.jər/

Unfamiliar

不熟悉的; 陌生的

Meaning

not known or recognized; strange

Example

The city was unfamiliar to me since I had never been there before.

这座城市对我来说很陌生，因为我以前从未去过那里。

B1 adjective /ʌnˈfeər/

Unfair

不公平; 不正当;

Meaning

not right or just; treating people in a way that favors some over others

Example

It's unfair to blame her for something she didn't do.

指责她做了她没有做的事是不公平的。

B1 verb /ˈʌpˌɡreɪd/

upgrade

升级

Meaning

to raise something to a higher standard, improve

Example

We decided to upgrade the software to the latest version.

我们决定将软件升级到最新版本。

C2 verb /ˌʌndərˈɡɜːrd/

undergird

支持，强化

Meaning

to provide support or foundation for; to strengthen

Example

Strong values undergird a healthy society.

强大的价值观支撑着一个健康的社会。

B2 adjective /ˌʌndɪˈzaɪərəbl/

Undesirable

不受欢迎的; 有害的; 令人不快的

Meaning

not wanted or wished for; harmful or unpleasant

Example

The new policy had several undesirable consequences.

新政策带来了几个不受欢迎的后果。

C2 noun /ˈʌmbrɪdʒ/

umbrage

冒犯，愤怒

Meaning

A feeling of resentment or offense.

Example

She took umbrage at his rude remark.

她对他的粗鲁言论感到愤怒。

B1 adjective /ʌnˈseɪf/

Unsafe

不安全; 危险的;

Meaning

involving or causing danger or risk; not protected from harm

Example

It is unsafe to walk alone in this neighborhood at night.

晚上在这个社区独自行走是不安全的。

C1 adjective /ˌʌnəˈfɛktɪd/

unaffected

不受影响的, 自然的

Meaning

Not influenced or touched by something; genuine and natural.

Example

He remained unaffected by the criticism and kept working hard.

他对批评毫不受影响，继续努力工作。

B1 adjective /ʌnˈlaɪk/

Unlike

不同的; 不相似的

Meaning

different from; not similar to

Example

Unlike his brother, he prefers quiet activities.

与他哥哥不同，他喜欢安静的活动。

B2 verb /ˌʌndərˈɛstɪmeɪt/

underestimate

低估

Meaning

To judge something as less important or smaller than it really is.

Example

Never underestimate the power of teamwork.

永远不要低估团队合作的力量。

B2 adjective /ˌʌnəˈweər/

Unaware

无意识的; 不知道的; 没有意识

Meaning

not knowing or realizing; having no knowledge of something

Example

She was completely unaware of the danger.

她完全没有意识到危险。

C1 adjective /ˌʌnrɪˈfaɪnd/

unrefined

未精炼的

Meaning

not processed or purified; lacking polish or sophistication

Example

The unrefined oil must be processed before it can be used as fuel.

未精炼的石油在用作燃料之前必须进行加工。

C1 adjective /ʌnˈsaɪtli/

unsightly

难看

Meaning

Unpleasant to look at; ugly.

Example

The garbage pile created an unsightly view in the park.

垃圾堆在公园里创造了一个难看的景象。

B2 adverb /ʌnˈdaʊtɪdli/

undoubtedly

毫无疑问

Meaning

without a doubt, certainly

Example

He is undoubtedly the best player on the team.

他毫无疑问是队里最好的球员。

C1 adjective /ʌnˈfɛtərd/

unfettered

不受限制的

Meaning

not restricted or confined; free

Example

The artist enjoyed unfettered freedom of expression.

艺术家享受了无限制的表达自由。

A2 adjective /ˈjuːʒəl/

usual

常见

Meaning

habitually or typically occurring or done

Example

It’s our usual meeting spot.

这是我们常见的会议地点。

B2 adjective /ˈʌpˌhɪl/

Uphill

困难的; 需要巨大努力的; 向上的倾斜

Meaning

difficult; requiring great effort; sloping upward

Example

Learning a new language can be an uphill battle.

学习一门新语言可能是一个艰难的战斗。

C1 verb /ʌpˈruːt/

uproot

拔除

Meaning

To pull something out of the ground; to remove or displace completely.

Example

They uprooted the old tree from the garden.

他们从花园里把老树拔了出来。

C1 adjective /ˌʌnəkˈnɒlɪdʒd/

unacknowledged

未承认的

Meaning

Not recognized, admitted, or accepted; ignored or unnoticed

Example

Her contributions to the project went unacknowledged.

她对项目的贡献未被承认。

C2 noun /ˈjuːʒəri/

usury

高利贷

Meaning

The practice of lending money at unreasonably high interest rates.

Example

The law strictly prohibits usury.

法律严格禁止高利贷。

B1 adjective /ʌnˈeɪ.bəl/

Unable

无法

Meaning

lacking the power, skill, or means to do something

Example

He was unable to attend the meeting.

他无法参加会议。

B2 verb ˈjuːnɪfaɪ

unify

统一

Meaning

To make or become united, uniform, or whole; to bring together into a single unit.

Example

Adolescents unify with peers for social acceptance.

青少年为了社会接纳与同伴统一。

C2 noun /juːˈkeɪs/

ukase

法令

Meaning

An authoritative decree or order, especially one issued by a sovereign or government.

Example

The czar issued a ukase restricting the freedom of the press.

沙皇发布了一项限制新闻自由的法令。

B2 adjective /ˌʌnəˈvɔɪdəbəl/

Unavoidable

不可避免的; 无法回避的; 必然的

Meaning

cannot be avoided; certain to happen; inevitable

Example

The meeting is unavoidable, so we must attend.

这个会议是无法避免的，我们必须参加。

B2 adjective /ʌnˈrɪəl/

unreal

不真实的

Meaning

not real or not based on reality; exaggerated or imaginary

Example

The experience felt unreal after the sudden news.

突如其来的消息后，这种经历感觉不真实。

C1 adjective ˌʌn.pəˈtɜːbd

unperturbed

不为某事烦恼或困扰；冷静且镇定

Meaning

Not worried or disturbed by something; calm and composed.

Example

She remained unperturbed despite the challenges.

尽管有挑战，她依然保持冷静。

C2 adjective /ʌnˈtʃeɪst/

Unchaste

不道德的; 不纯洁的;

Meaning

not celibate; having engaged in sexual relations; lacking moral purity

Example

The conservative society considered her behavior unchaste and improper.

保守的社会认为她的行为不道德和不合适。

B2 adjective /ʌnhaɪˈdʒiːnɪk/

Unhygienic

不卫生的；缺乏适当的卫生

Meaning

not clean; lacking proper sanitation

Example

The restaurant was closed due to unhygienic conditions in the kitchen.

由于厨房不卫生的条件，餐厅被关闭。

C1 adjective /ʌnˈsɪvəlaɪzd/

Uncivilized

未开化的; 野蛮的;

Meaning

not developed in terms of civilization; lacking social organization and culture; barbarous

Example

The explorers encountered an uncivilized tribe deep in the Amazon rainforest.

探险者在亚马逊雨林深处遇到一个未开化的部落。

B1 adjective /ʌnˈkʊkt/

uncooked

生的

Meaning

Not cooked; in a raw state.

Example

Eating uncooked meat can be dangerous.

吃生肉可能是危险的。

C1 adjective /ˌjuːnɪˈlætərəl/

Unilateral

单方面

Meaning

one-sided; involving only one party

Example

The country made a unilateral decision to withdraw from the treaty.

这个国家做出了单方面的决定，退出了条约。

C2 adjective /ʌnˈsʌlid/

unsullied

无暇

Meaning

not spoiled or made impure; perfectly clean or pure

Example

His reputation remained unsullied despite the accusations.

尽管有指控，他的声誉仍然无暇。

C2 noun /ˈʌŋkʃən/

unction

涂抹

Meaning

The act of anointing as part of a religious or ceremonial ritual; excessive or insincere flattery.

Example

The priest performed the holy unction with solemnity.

牧师庄重地进行了神圣的涂抹仪式。

B2 noun ˌjuːtɪlaɪˈzeɪʃən

utilization

利用

Meaning

The action of making practical and effective use of something.

Example

Increased plastic utilization calls for better waste management.

塑料的使用增加要求更好的废物管理。

C1 noun /ˈʌndərdɒɡ/

underdog

逆袭者

Meaning

a competitor thought to have little chance of winning; a weaker party in a contest

Example

The underdog team surprised everyone by winning the championship.

逆袭者队伍通过赢得锦标赛让所有人都惊讶。

B2 adjective /ʌnˈriːdəbl/

unreadable

难以辨认的

Meaning

not able to be read or understood clearly; illegible

Example

The doctor’s handwriting was completely unreadable.

医生的字迹完全难以辨认。

C2 adverb /ʌnˈɜːrɪŋli/

unerringly

毫无错误

Meaning

Without making any mistakes; always accurate

Example

The archer aimed unerringly at the target.

弓箭手毫无错误地瞄准了目标。

B2 adjective /ˈjuː.nɪ.faɪd/

unified

统一

Meaning

Made into a whole or joined together.

Example

A unified approach fosters better outcomes.

统一的方法促进了更好的结果。

C1 adjective /ʌnˈduː/

Undue

过度的; 不适当的; 超过必要或适当的

Meaning

excessive; inappropriate; more than is necessary or proper

Example

The teacher complained about undue pressure from parents.

老师抱怨家长施加的过度压力。

C1 noun ˈʌp.raɪ.zɪŋ

uprising

起义

Meaning

An act of resistance or rebellion; a revolt against an authority or government.

Example

The uprising marked the beginning of the revolution.

起义标志着革命的开始。

C1 adjective /ʌnˈmænɪdʒəbəl/

Unmanageable

无法控制的; 失控

Meaning

difficult or impossible to control or handle

Example

The large class became unmanageable without proper supervision.

没有适当的监督，班级变得无法控制。

B2 adjective /ʌnˈbæləns/

Unbalanced

不平衡的; 不稳定的

Meaning

not balanced; lacking stability or equilibrium; mentally unstable

Example

The unbalanced table kept wobbling.

不平衡的桌子摇晃着。

C1 adjective /ʌnˈkɒm.prə.maɪ.zɪŋ/

Uncompromising

不妥协, 固执

Meaning

unwilling to change one's views or to agree about something; showing an unwillingness to make concessions to others

Example

He was uncompromising in his demand for a full apology.

他在要求完全道歉时非常坚决。

B2 adjective /ˌʌnkənˈvɪnsɪŋ/

Unconvincing

不可信

Meaning

failing to persuade or impress; not believable or credible

Example

His excuse for being late was completely unconvincing.

他因迟到而给出的借口完全不可信。

B1 adjective /ʌnˈwel/

Unwell

不舒服; 生病

Meaning

not in good health; feeling sick or ill

Example

She has been feeling unwell since yesterday.

她从昨天开始感到不舒服。

C2 adjective /ˈʌndjʊleɪtɪŋ/

undulating

波动的

Meaning

Having a smoothly rising and falling form or motion like waves.

Example

We drove through undulating hills.

我们驱车穿过起伏的山丘。

B2 adjective /ʌnəˈfreɪd/

unafraid

无畏

Meaning

Not feeling fear; brave or courageous

Example

She walked into the dark room, unafraid of what might be inside.

她走进黑暗的房间，无畏里面可能有什么。

C2 adjective /ʌnˈflɛdʒd/

unfledged

未经训练的

Meaning

Inexperienced, immature, or not fully developed.

Example

The unfledged writer struggled to complete his first novel.

这个未经训练的作家难以完成他的第一本小说。

C1 noun /ˌjuːnɪˈfɔːrməti/

Uniformity

一致性；统一性；相同状态

Meaning

the quality of being uniform; consistency or sameness

Example

The uniformity of the design created a pleasing visual effect.

设计的一致性创造了一个吸引人的视觉效果。

B2 adjective /ʌnˈtʃeɪndʒəbəl/

Unchangeable

不可改变的; 固定的;

Meaning

not able to be changed or altered; fixed and permanent

Example

The laws of physics are unchangeable principles that govern the universe.

物理法则是不变的原则，支配着宇宙。

C1 adjective /juːˈbɪkwɪtəs/

ubiquitous

无处不在

Meaning

Existing or being everywhere at the same time.

Example

Social media has become ubiquitous among young people.

社交媒体在年轻人中变得无处不在。

B2 noun /ˌʌnəˌveɪləˈbɪləti/

unavailability

不可用性

Meaning

The state of being not available or not accessible.

Example

The unavailability of the manager caused a delay in the project.

经理的不可用性导致了项目的延误。

A2 conjunction /ʌnˈlɛs/

unless

除非

Meaning

except if

Example

We won't go unless it stops raining.

除非雨停了，否则我们不去。

没有暗示

Meaning

Not giving a hint or suggestion; not indicating.

Example

His unintimating tone gave no clue of his true feelings.

他的没有暗示的语气没有透露他真正的感受。