B1 adjective ʌnˈplænd

unplanned

未计划的

Meaning

Not planned or arranged in advance; happening spontaneously without preparation.

Example

Unplanned urbanization contributes to environmental issues.

无计划的城市化会加剧环境问题。

B1 adjective /ʌnˈfɔːr.tʃən.ət/

Unfortunate

不幸的；遗憾的

Meaning

having bad luck; regrettable or unlucky

Example

It was unfortunate that the meeting was cancelled at the last minute.

很不幸的是，会议在最后一刻被取消了。

C1 noun /juːˈtoʊpiə/

utopia

乌托邦

Meaning

An imagined perfect society or place where everything is ideal.

Example

Many philosophers dreamed of creating a utopia for humanity.

许多哲学家梦想着为人类创造一个乌托邦。

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。

B2 adjective /ʌnˈnætʃərəl/

Unnatural

不自然的

Meaning

not existing in nature; artificial; forced

Example

The actor's smile looked unnatural and forced.

演员的笑容看起来很不自然，很勉强。

C1 noun /ˌʌnbɪˈliːf/

Unbelief

不信

Meaning

lack of religious belief; skepticism or doubt

Example

His unbelief in the supernatural made him a skeptic.

他对超自然的怀疑使他成为了一个怀疑者。

C1 adjective /ʌnˈɜːrθli/

unearthly

超自然的

Meaning

Strange or unnatural in a way that seems not of this world

Example

The forest was filled with an unearthly glow.

森林中充满了超自然的光辉。

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。

C2 adjective /ˌʌltrəˈmɒnteɪn/

ultramontane

教皇支持者

Meaning

beyond the mountains, especially referring to support for the Pope over local church authority

Example

The debate highlighted the ultramontane position in church politics.

辩论突出了教会政治中超山的立场。

A2 noun /ˌʌpˈsteəz/

Upstairs

楼上

Meaning

on or to an upper floor of a building; the upper floor or floors

Example

She went upstairs to her bedroom to rest.

她上楼去她的卧室休息。

C2 adjective /ʌnˈspɛərɪŋ/

unsparing

无情的

Meaning

Showing no mercy or generosity; harsh or severe.

Example

The critic was unsparing in his review of the play.

评论家在他的剧评中毫不留情。

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。

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。

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。

B2 noun /ʌnˈsɜːrtənti/

Uncertainty

不确定性; 怀疑或缺乏确信

Meaning

the state of being uncertain; doubt or lack of sureness

Example

The uncertainty about the weather delayed our trip.

关于天气的不确定性延迟了我们的旅行。

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 /ʌnˈbaɪəst/

unbiased

公正

Meaning

Not showing prejudice; impartial and fair.

Example

The report gave an unbiased view of the situation.

报告提供了该情况的公正观点。

B2 adjective /ʌn.rɪˈleɪ.tɪd/

Unrelated

无关的; 不相关

Meaning

having no connection or relationship; not connected by family ties

Example

The two incidents were completely unrelated to each other.

这两个事件完全无关。

B2 verb /ʌpˈhoʊld/

uphold

维护

Meaning

to maintain or support a principle, law, or decision

Example

The judge promised to uphold justice at all costs.

法官承诺不惜一切代价维护正义。

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。

A2 preposition /əˈpɒn/

upon

之后

Meaning

on or immediately after

Example

Upon hearing the news, he rushed to the hospital.

听到消息后，他赶到医院。

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。

C1 adjective /ʌnˈsiːmli/

unseemly

不得体

Meaning

Not proper or appropriate in behavior or appearance; unbecoming.

Example

His unseemly remarks embarrassed everyone at the dinner table.

他不得体的言论让晚餐桌上的每个人都感到尴尬。

B2 adverb /ʌnˈfɛərli/

unfairly

不公平地

Meaning

In a manner that is not just, reasonable, or impartial

Example

He was treated unfairly by the committee.

他被委员会不公平地对待。

C2 noun/verb /ˈʌpˌkæst/

upcast

向上投掷

Meaning

Verb: To cast or throw upward. Noun: Something thrown or directed upward.

Example

The fisherman upcast his net into the air.

渔夫把他的网投向空中。

C2 noun /juːˌtɪlɪˈtɛəriənɪzəm/

utilitarianism

功利主义

Meaning

The ethical theory that actions are right if they are useful or for the benefit of the majority.

Example

Utilitarianism suggests that we should act to maximize overall happiness.

功利主义认为我们应该采取行动，以最大化整体幸福。

B2 adverb /ˈʌt.ə.li/

Utterly

完全地; 绝对地; 完整地

Meaning

completely; absolutely; totally

Example

The movie was utterly boring and I fell asleep.

电影完全无聊，我睡着了。

B2 adjective /ʌnˈlɪmɪtɪd/

unlimited

无限

Meaning

without any limits or restrictions

Example

The internet plan offers unlimited data for the whole month.

该互联网计划提供整个一个月的无限数据。

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 adverb /ʌnˈfɔːrtʃənətli/

Unfortunately

不幸地

Meaning

used to express regret or disappointment about something

Example

Unfortunately, the weather was bad for our picnic.

很遗憾，天气不适合我们的野餐。

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。

B1 adjective /ˈʌpər/

upper

上层

Meaning

higher in position or rank

Example

The upper floor of the building is under renovation.

建筑物的上层正在翻修。

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。

B2 adjective /ʌnˈkɒmən/

uncommon

不常见

Meaning

rare, unusual, or remarkable

Example

It is uncommon to see snow in this region.

在这个地区看到雪是不常见的。

B1 adjective /ʌnˈplɛz.ənt/

Unpleasant

令人不悦的

Meaning

not giving or causing pleasure; disagreeable

Example

The medicine had an unpleasant taste.

药物有一种令人不悦的味道。

B2 adjective /ˌʌnəˈveɪləbəl/

unavailable

不可用

Meaning

Not able to be obtained, reached, or used; not present or accessible.

Example

The manager was unavailable to take calls during the meeting.

经理在会议期间不可用，无法接听电话。

A2 adjective /ʌnˈlʌki/

Unlucky

倒霉; 不幸运

Meaning

having bad luck; unfortunate

Example

He was unlucky to miss the winning shot.

他很倒霉错过了获胜的投篮。

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。

B2 noun /ˈʌndərkləʊðz/

underclothes

内衣

Meaning

Clothing worn beneath outer clothes, such as underwear or lingerie

Example

He folded his underclothes neatly before packing them.

他在打包前把内衣叠得整整齐齐。

C2 adjective /ʌnˈmɪtɪɡeɪtɪd/

unmitigated

完全

Meaning

absolute; not lessened or moderated

Example

The meeting was an unmitigated disaster.

会议是一次完全的灾难。

B2 adverb /ʌnˈplɛzəntli/

unpleasantly

令人不快地

Meaning

in a way that causes discomfort, annoyance, or displeasure; in an unfriendly or disagreeable manner

Example

The room was unpleasantly hot during the afternoon.

下午房间里热得令人不快。

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。

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。

B1 noun /juːˈten.səlz/

Utensils

餐具

Meaning

tools or implements used for cooking, eating, or serving food

Example

Please wash all the cooking utensils after preparing dinner.

请在准备晚餐后清洗所有的厨房用具。

B1 verb /ʌnˈpæk/

unpack

拆开

Meaning

to remove items from a container; to explain or analyze something in detail

Example

After arriving home, she began to unpack her suitcase.

到家后，她开始拆开自己的行李箱。

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。

B2 noun /ʌnˈrest/

Unrest

不安；动荡；社会或政治动乱

Meaning

a state of dissatisfaction and disturbance; social or political disorder

Example

The economic crisis led to widespread social unrest.

经济危机导致了广泛的社会不安。

B2 adjective /ʌnˈiːkwəl/

Unequal

不平等; 不公正;

Meaning

not the same in quantity, size, or value; not fair or just

Example

The distribution of wealth is unequal in many countries.

财富的分配在许多国家是不平等的。

B2 adjective /ʌnˈkɒn.ʃəs/

Unconscious

昏迷; 无意识

Meaning

not awake and aware of one's surroundings; done or existing without one realizing

Example

The patient was unconscious for several hours after the surgery.

病人在手术后昏迷了几个小时。

B2 adjective /ˌʌnprɪˈdɪktəbəl/

unpredictable

不可预测的

Meaning

not able to be predicted; changing suddenly and unexpectedly

Example

The weather in this region is highly unpredictable.

这个地区的天气非常不可预测。

C1 adjective ʌnɪnˈhæbɪtəbəl

uninhabitable

不可居住

Meaning

Not suitable or safe for people to live in.

Example

Rapid urbanization can make cities uninhabitable.

快速城市化可能使城市变得无法居住。

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。

C1 adjective + noun ʌnˈpresɪdentɪd ˈnɒlɪdʒ

unprecedented knowledge

前所未有的知识

Meaning

Information or understanding that has never been obtained or achieved before.

Example

Artemis will provide unprecedented knowledge about the solar system.

阿尔忏将提供关于太阳系的前所未有的知识。

B1 adjective /ˌʌnˈpeɪd/

Unpaid

未支付的; 无薪的

Meaning

not paid for; without payment or salary

Example

She worked as an unpaid intern for six months.

她作为一名无薪实习生工作了六个月。

C1 adjective /ʌnˈtaɪmli/

Untimely

不合时宜

Meaning

happening at an inappropriate or inconvenient time; premature

Example

His untimely death at the age of thirty shocked everyone.

他的过早死亡在30岁时震惊了所有人。

B2 verb /ʌnˈfəʊld/

unfold

展开或打开

Meaning

to open or spread out something that was folded; to gradually reveal or develop

Example

She unfolded the letter carefully.

她小心地展开了信件。

B2 adjective /ʌnprəˈfɛʃ.ən.əl/

Unprofessional

不专业

Meaning

not conforming to the standards expected in a particular profession

Example

His unprofessional behavior led to his dismissal from the company.

他的不专业行为导致他被公司解雇。

A2 adjective /ˈjuːs.ləs/

Useless

无用

Meaning

having no beneficial purpose; not useful

Example

This broken computer is completely useless.

这个坏掉的电脑完全是无用的。

B2 adjective /ˌʌnəˈfɪʃ.əl/

Unofficial

非官方的

Meaning

not officially authorized or confirmed; informal

Example

The unofficial results showed a close race.

非官方的结果显示出一场激烈的比赛。

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 /ʌnˈwəʊntɪd/

unwonted

不寻常

Meaning

Unusual, uncommon, or out of the ordinary.

Example

She spoke with an unwonted gentleness that surprised everyone.

她以一种不寻常的温柔说话，令所有人都感到惊讶。

C1 adjective /ʌnˈsɪvəl/

Uncivil

不文明的; 粗鲁的;

Meaning

not polite or courteous; rude and discourteous in behavior

Example

His uncivil remarks during the meeting offended everyone present.

他在会议上的不文明言论冒犯了在场的每一个人。

C2 adjective /ʌnˈtræməld/

untrammeled

无限自由

Meaning

Not restricted or hampered; free and unrestricted.

Example

She enjoyed untrammeled freedom in her new life abroad.

她在国外的新生活中享受着无限自由。

A2 noun /ˈʌndərweər/

underwear

内衣

Meaning

Clothing worn beneath outer clothes, typically next to the skin.

Example

He bought new underwear for the trip.

他为旅行买了新的内衣。

B2 adverb /ˈʌltəmətli/

ultimately

最终

Meaning

in the end, after everything else

Example

Ultimately, we decided to go ahead with the project.

最终，我们决定继续推进该项目。

B2 adjective /ʌnˈprɒf.ɪ.tə.bl̩/

Unprofitable

无利可图

Meaning

not yielding profit or gain; not producing financial benefit

Example

The unprofitable business was forced to close down after three years.

这个无利可图的生意在三年后被迫关闭。

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。

B2 adjective /ʌnˈfeɪ.vər.ə.bəl/

Unfavourable

不利的; 逆境的

Meaning

not helpful or advantageous; adverse

Example

The weather conditions were unfavourable for our outdoor event.

恶劣的天气条件不利于我们的户外活动。

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。

C1 adjective /ʌnˈsoʊld/

unsold

未售出的

Meaning

not sold; remaining without a buyer

Example

The unsold goods were returned to the warehouse.

未售出的商品被退回仓库。

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。

C2 verb /ʌnˈɑːrm/

unarm

解除武装

Meaning

to remove weapons from someone or to deprive of means of attack or defense

Example

The soldiers were ordered to unarm the prisoners.

士兵接到命令解除囚犯的武装。

C2 adjective /ʌnˈlɛtəd/

unlettered

文盲

Meaning

lacking education or the ability to read and write; illiterate

Example

The unlettered villagers relied on oral traditions to preserve their history.

那些文盲村民依赖口头传统来保存他们的历史。

B2 adjective /ʌnˈsuːtəbl/

Unsuitable

不适合; 不合适

Meaning

not fitting or appropriate for a particular purpose or situation

Example

This formal dress is unsuitable for a casual beach party.

这件正式的衣服不适合参加随意的海滩派对。

B2 verb /ʌnˈkʌvə(r)/

uncover

揭示

Meaning

to reveal something that was hidden or secret

Example

The investigation uncovered new evidence.

调查揭示了新的证据。

B2 adverb /ˈɜːrdʒəntli/

urgently

紧急地

Meaning

in a way that requires immediate attention or action

Example

The patient urgently needs medical attention.

病人紧急地需要医疗救助。

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 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。

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 /ˈʌpˌkiːp/

up-keep

维护

Meaning

The process or cost of maintaining something in good condition.

Example

The upkeep of the old house is very expensive.

老房子的维护非常昂贵。

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。

C1 verb /ˌʌndərˈvæljuː/

undervalue

低估

Meaning

To assign too low a value or importance to something or someone.

Example

She felt that her boss consistently undervalued her contributions.

她感觉到她的老板总是低估她的贡献。

B2 verb /ˌʌndərˈteɪk/

undertake

承担

Meaning

to commit to and begin a task or project; to take on responsibility

Example

She decided to undertake a challenging project.

她决定承担一个具有挑战性的项目。

A1 adjective /ˈjuːs.fəl/

Useful

有用的; 实用的

Meaning

having a beneficial purpose; practical

Example

This tool is very useful for fixing problems.

这个工具对解决问题非常有用。

C1 adjective /ʌnˈmaɪndfəl/

Unmindful

不留心的; 疏忽的;

Meaning

not paying attention; careless; heedless

Example

She was unmindful of the danger around her.

她没有注意到周围的危险。

C1 noun /ʌnkənˈsɜːrn/

Unconcern

漠不关心

Meaning

lack of worry or interest; indifference

Example

She showed complete unconcern about the criticism.

她对批评表现出了完全的漠不关心。

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。

A2 adjective /ˈʌɡ.li/

Ugly

丑陋的; 可憎的; 可怕的

Meaning

unpleasant or repulsive in appearance; morally reprehensible

Example

The old building looked ugly after years of neglect.

这座老建筑在多年疏忽之后看起来很丑。

C1 adjective /ˌjuːnɪˈsɛljʊlər/

unicellular

单细胞

Meaning

Consisting of a single cell.

Example

Amoebas are unicellular organisms.

变形虫是单细胞生物。

C1 adjective /ʌnˈdɔːntɪd/

Undaunted

无畏的; 勇敢的; 不屈的;

Meaning

not intimidated or discouraged by difficulty, danger, or disappointment

Example

Despite the setbacks, she remained undaunted in pursuing her goals.

尽管遇到挫折，她在追求目标时依然无畏。

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 /ˌʌnɪˈmædʒənəbəl/

Unimaginable

难以想象的

Meaning

impossible to conceive; beyond imagination

Example

The scale of destruction was unimaginable until we saw it firsthand.

毁灭的规模是难以想象的，直到我们亲眼看到。

C2 noun /ˈjuːzjuːfrʌkt/

usufruct

使用权

Meaning

The legal right to use and enjoy the benefits of someone else’s property without owning it.

Example

The tenant had the usufruct of the land but not its ownership.

租户有权使用这片土地，但没有所有权。

B2 noun /ʌnəˈbɪləti/

unability

无能

Meaning

the state of being unable to do something; incapacity

Example

His unability to solve the problem caused delays in the project.

他解决问题的无能导致了项目的延误。

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 verb /ˌʌndəˈreɪt/

underrate

低估

Meaning

to fail to recognize the full value or importance of something or someone

Example

Many people underrate the benefits of regular exercise.

许多人低估了规律锻炼的好处。

B1 adjective /ʌnˈpɒpjʊlə/

unpopular

不受欢迎的

Meaning

not liked or supported by many people

Example

The decision was unpopular with the public.

这个决定在公众中不受欢迎。

C2 verb /ʌnˈfrɒk/

unfrock

剥夺神职

Meaning

To remove a priest from his position or deprive someone of a rank.

Example

The corrupt priest was unfrocked after the investigation.

腐败的牧师在调查后被解除职务。

C1 adjective /ʌnˈʃeɪkən/

Unshaken

坚定不移; 坚固

Meaning

not disturbed or affected; firm and steady; unwavering

Example

Her faith remained unshaken despite all the challenges.

尽管面临所有挑战，她的信念依然坚定不移。

B1 adjective /ˈɜːrbən/

urban

城市的

Meaning

related to, characteristic of, or situated in a city or town

Example

Urban areas often have higher population density than rural areas.

城市地区通常比乡村地区有更高的人口密度。

B2 adjective /ʌnˈɡreɪt.fəl/

Ungrateful

忘恩负义

Meaning

not feeling or showing thanks for something done or given; not appreciating kindness

Example

She felt he was ungrateful for all the help she had given him.

她觉得他对她给予的所有帮助都忘恩负义。

B2 adjective /ˌʌnˈkɔːrdɪneɪtɪd/

uncoordinated

不协调; 笨拙

Meaning

lacking coordination, not well-organized or clumsy in movement

Example

His movements were uncoordinated, making him prone to accidents.

他的动作不协调，使他容易发生意外。

B1 adjective /ˌʌnsəkˈsesfl/

Unsuccessful

失败的; 没有成功的;

Meaning

not achieving desired aims or results; failing to accomplish a purpose

Example

His unsuccessful attempt to climb the mountain left him disappointed.

他未能成功登上山顶，感到失望。

C1 adjective /ˌʌnəˈsjuːmɪŋ/

unassuming

谦虚

Meaning

Not pretentious or arrogant; modest.

Example

Despite his success, he remained unassuming and humble.

尽管他取得了成功，他仍然谦虚和谦逊。

B2 adjective /ˌʌnɪnˈfɔːrmd/

uninformed

不了解情况的

Meaning

lacking knowledge or awareness about a particular subject; not educated or informed

Example

The decision was made by an uninformed committee.

这个决定是由一个不了解情况的委员会做出的。

C2 verb /ˌʌn.dɪˈsiːv/

undeceive

解惑

Meaning

To free someone from a misconception or false belief.

Example

She tried to undeceive him about the false rumors.

她试图让他摆脱这些错误的谣言。

C1 adjective ʌnˈtʃɑːtɪd

uncharted

未标记

Meaning

Not mapped or surveyed; unknown or unexplored.

Example

The mission aimed to explore uncharted areas of the planet.

该任务旨在探索星球上未标记的区域。

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。

C1 adjective /ˈʌpərˌmoʊst/

uppermost

最高

Meaning

situated at the highest place or most important

Example

Her family's safety was uppermost in her mind during the crisis.

她在危机期间心里最重要的是家庭的安全。

C2 adjective /ʌnˈælɔɪd/

unalloyed

纯净

Meaning

Pure, complete, and not mixed with anything else.

Example

She felt unalloyed joy at the news of her success.

她听到成功的消息时感到纯粹的喜悦。

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。

C2 noun /ʌnˈkloʊðɪŋ/

unclothing

脱衣

Meaning

the act or process of removing clothing

Example

The child quickly ran inside for unclothing after playing in the mud.

孩子在泥地玩耍后迅速跑进去脱衣。

B2 adjective /ʌnˈtʃeɪndʒɪŋ/

unchanging

不变的

Meaning

remaining the same over time; not changing

Example

Her love for her family was unchanging throughout the years.

她对家人的爱多年来始终不变。

B1 noun /ˈjuːnɪvɜːrs/

Universe

宇宙

Meaning

all existing matter and space; the cosmos

Example

Scientists study the universe to understand its mysteries.

科学家研究宇宙，以理解它的奥秘。

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。

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。

B2 adjective /ˌʌnɪnˈtenʃənəl/

Unintentional

非故意的；意外的

Meaning

not done on purpose; accidental

Example

The damage to the car was unintentional.

车的损坏是非故意的。

B2 noun /ˈjuː.sɪdʒ/

Usage

使用

Meaning

the action of using something; the way in which words are used in a language

Example

The dictionary explains the correct usage of difficult words.

词典解释了难词的正确用法。

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。

C1 adjective /ʌnˈkʌltʃəd/

Uncultured

不文明的; 无文化的

Meaning

lacking good manners, refinement, or education; uncivilized

Example

His uncultured behavior embarrassed everyone at the dinner party.

他在晚宴上的不文明行为让所有人感到尴尬。

B1 adjective /ʌnˈedjʊkeɪtɪd/

Uneducated

未受教育的; 文盲

Meaning

lacking education; not having received formal schooling or training

Example

Many uneducated workers struggle to find well-paying jobs.

许多未受教育的工人很难找到薪水高的工作。