B2 noun ˈoʊzoʊn dɪˈpliʃən

ozone depletion

臭氧消耗

Meaning

The reduction in the amount of ozone in the Earth's stratosphere, leading to increased UV radiation.

Example

Ozone depletion increases UV radiation.

臭氧消耗增加了紫外线辐射。

B2 noun /ɒdz/

odds

可能性

Meaning

the likelihood or probability of something happening; chances for or against something

Example

The odds of winning the lottery are very low.

中彩票的机会非常小。

B2 noun ɔːˈɡæn.ɪk fuːdz

organic foods

有机食品

Meaning

Food produced without the use of chemicals such as artificial pesticides, fertilizers, or other artificial agents.

Example

Organic foods are healthier than processed foods.

有机食品比加工食品更健康。

B2 adjective ɔːrˈɡæn.ɪk

organic

有机的

Meaning

Produced or involving production without the use of chemical fertilizers, pesticides, or other artificial agents.

Example

Organic farming improves soil health and reduces pollution.

有机农业改善土壤健康并减少污染。

B2 adjective ˌɒp.ərˈeɪ.ʃən.əl

operational

操作的

Meaning

In working order; ready for use.

Example

The space project will be operational by 2025.

太空项目将在2025年投入使用。

B2 adjective /ˌɔːɡənaɪˈzeɪʃənəl/

organizational

组织性的

Meaning

relating to the structure or arrangement of a company or group

Example

He works on improving the organizational structure of the company.

他在改善公司的组织结构方面工作。

B2 adjective + noun ˈɒptɪməl ˈtempərətʃər

optimal temperature

最佳温度

Meaning

The best or most favorable temperature for a particular purpose

Example

Winter provides optimal temperature for farming.

冬天提供了农业的最佳温度。

B2 noun ˈəʊnəʃɪp

ownership

所有权

Meaning

The act, state, or right of possessing something; legal title to something.

Example

Ownership of resources was crucial.

资源的所有权至关重要。

B2 noun /ˈaʊtlʊk/

outlook

前景, 预测

Meaning

a person's general attitude or view; a forecast or prospect

Example

The economic outlook for the year is positive.

今年的经济前景是积极的。

B2 adjective /aʊtˈreɪdʒəs/

outrageous

骇人听闻

Meaning

Shockingly bad or excessive; very unusual or amusing.

Example

The comedian told an outrageous joke.

这位喜剧演员讲了一个骇人听闻的笑话。

B2 noun /oʊˈbiː.di.əns/

Obedience

服从

Meaning

compliance with an order, request, or law; submission to authority

Example

Children should show obedience to their parents.

孩子们应该对父母表现出服从。

B2 noun /əˈpoʊ.nənt/

Opponent

对手; 竞争者

Meaning

a person who disagrees with or resists a proposal or practice; someone who competes against another

Example

The chess player defeated his strongest opponent.

象棋选手击败了他最强的对手。

B2 adverb /ˌoʊvərˈnaɪt/

Overnight

一夜之间; 突然; 非常快速

Meaning

during the night; suddenly; very quickly

Example

The city was transformed overnight.

这座城市一夜之间发生了变化。

B2 adjective; verb (past participle) /ˈɒkjʊpaɪd/

occupied

被占用的；被占领的

Meaning

being in use or taken; filled or lived in; controlled or held by force

Example

The room is occupied, so please wait outside.

房间被占用，请在外面等候。

B2 adjective /ˈɔɪl.i/

Oily

油腻的; 油覆盖的; 油滑的

Meaning

covered with oil; containing oil; greasy

Example

Her oily skin needs special care.

她的油腻皮肤需要特别护理。

B2 verb /ˌoʊvərˈkʌm/

overcome

克服

Meaning

To succeed in dealing with a problem or difficulty.

Example

You can overcome procrastination with planning.

你可以通过计划来克服拖延症。

B2 verb /ˌoʊvərˈloʊd/

overload

过载

Meaning

to load with too much weight or cargo; to give too much work or information

Example

Don't overload the washing machine or it might break down.

不要过载洗衣机，否则它可能会坏掉。

B2 verb /əˈpoʊz/

oppose

反对

Meaning

to disagree with or resist; to act against

Example

Many citizens oppose the new tax policy.

许多公民反对新的税收政策。

B2 adjective /ˌoʊvərˈwɛlmɪŋ/

overwhelming

压倒性的

Meaning

Very intense; overpowering.

Example

Large tasks can feel overwhelming.

大型任务可能会让人感到压倒。

B2 noun /ˈaʊt.saɪ.dər/

Out-sider

局外人

Meaning

a person who does not belong to a particular group; someone not accepted by a group

Example

As an outsider, he found it difficult to understand their traditions.

作为外人，他发现很难理解他们的传统。

B2 verb /əbˈteɪn/

obtain

获得

Meaning

to get or acquire something

Example

You need to obtain a visa before traveling abroad.

你需要在出国前获得签证。

B2 noun /ˈaʊt.laɪn/

Outline

大纲; 轮廓; 摘要

Meaning

a general description or plan showing the essential features of something; the main points

Example

The teacher provided an outline of the course syllabus.

老师提供了课程大纲。

B2 noun /wʌn θɜːd/

one-third

三分之一

Meaning

one part of something that is divided into three equal parts

Example

One-third of the class was absent today.

班级的三分之一今天缺席。

B2 noun ˈɔː.bɪt

orbit

轨道

Meaning

The curved path of a celestial object around a star, planet, or moon.

Example

The satellite maintains its orbit around Earth.

卫星保持它绕地球的轨道。

B2 adverb /ˈoʊpənli/

Openly

公开地; 公共地

Meaning

in a frank and honest way; without concealment; publicly

Example

She spoke openly about her struggles with mental health.

她公开谈论了自己在心理健康方面的困难。

B2 verb /ˌoʊvərˈiːt/

overeat

幸福

Meaning

To eat more food than the body needs.

Example

She tends to overeat when she is stressed.

她在收到奖项时无法掩饰自己的幸福。

B2 noun /ˈɒfərɪŋ/

offering

提供

Meaning

something that is given, especially as a gift or contribution

Example

The company’s latest offering is an eco-friendly car.

公司的最新产品是一款环保汽车。

B2 noun /ˌoʊ.vɚˈkraʊ.dɪŋ/

overcrowding

过度拥挤

Meaning

Excessive crowd or packed condition, having more people or vehicles in a place than the approved capacity.

Example

The subway system suffers from severe overcrowding during peak hours.

地铁系统在高峰时段面临严重的过度拥挤。

B2 noun /ˈoʊtˌmiːl/

oatmeal

燕麦粥

Meaning

A type of porridge made from ground oats, often eaten for breakfast.

Example

She eats a bowl of oatmeal every morning for breakfast.

她每天早晨吃一碗燕麦粥当早餐。

B2 adjective /ˈɔː.də.li/

Orderly

有序的; 系统的; 平静的

Meaning

well-organized; systematic; peaceful

Example

Please keep your desk orderly and clean.

请保持您的桌面整齐和干净。

B2 noun /ˈɔr.fən/

Orphan

孤儿

Meaning

a child whose parents are dead; someone without protective support

Example

The orphan was adopted by a loving family.

孤儿被一户充满爱心的家庭收养了。

B2 verb /ˌoʊvərˈsiː/

oversee

监督

Meaning

to supervise or watch over something; to manage and direct

Example

The manager will oversee the entire construction project.

经理将监督整个建筑项目。

B2 noun /ˈɑp.tə.mɪst/

Optimist

乐观主义者

Meaning

a person who tends to be hopeful and confident about the future; someone who sees the good side of things

Example

As an optimist, she always believed things would improve.

作为乐观主义者，她一直相信事情会变得更好。

B2 noun /ˈaʊtlet/

outlet

出口

Meaning

a means by which something is released, expressed, or distributed

Example

Art is a great outlet for emotions.

艺术是情感的一个极好的出口。

B2 noun /ˈaʊtbɜːrst/

outburst

情感或活动的突然爆发

Meaning

a sudden release of strong emotion or activity

Example

She had an angry outburst during the meeting.

她在会议期间突然发火。

B2 adjective /aʊtˈstændɪŋ/

outstanding

杰出

Meaning

extremely good or impressive; not yet resolved or paid

Example

She received an award for her outstanding performance.

她因出色的表现获得了奖项。

B2 verb əbˈzɜːrvd

observed

庆祝

Meaning

To celebrate or keep a religious or other festival.

Example

The day is observed annually to raise awareness.

这一天每年庆祝，以提高意识。

B2 noun /ˌɒpəˈzɪʃən/

opposition

反对

Meaning

the action of opposing or resisting something

Example

The opposition to the new law was strong.

对新法律的反对很强烈。

B2 adverb /ˈaʊtraɪt/

Outright

直接; 完全; 毫不保留

Meaning

completely; directly; without reservation or concealment

Example

She rejected the proposal outright.

她直接拒绝了那个提案。

B2 noun /ˌɑb.zɚˈveɪ.ʃən/

Observation

观察

Meaning

the action of watching something carefully; a comment or remark

Example

The scientist made careful observations of the experiment.

科学家仔细观察了实验。

B2 adjective, verb /əbˈskjʊr/

obscure

模糊

Meaning

Not clearly expressed or understood; to make something difficult to see or understand.

Example

The meaning of the poem was obscure to most readers.

诗的意义对大多数读者来说是模糊的。

B2 adjective /ˈɒnɡəʊɪŋ/

ongoing

进行中

Meaning

continuing; still in progress

Example

The ongoing project will finish next month.

进行中的项目将在下个月完成。

B2 noun /əˈfɛns/

offense

犯罪

Meaning

an illegal act; a crime

Example

The offense was committed in broad daylight.

这个犯罪是在白天犯下的。

B2 noun /ˌaʊtˈsaɪdə(r)/

outsider

局外人

Meaning

a person who is not accepted as a member of a particular group or community

Example

As a new student, she often felt like an outsider at school.

作为新生，她常常觉得自己在学校是个局外人。

B2 verb /əˈrɪdʒɪneɪt/

originate

起源

Meaning

to come into existence; to begin; to create or produce

Example

The tradition originated in ancient times.

这个传统起源于古代。

B2 noun /oʊk/

oak

橡树

Meaning

a large tree that produces acorns and has strong, hard wood

Example

The old oak tree provided shade for the entire yard.

那棵老橡树为整个院子提供了阴凉。

B2 noun /ɔːrˈɡæn.ɪk ˈfɑːr.mɪŋ/

organic farming

有机农业

Meaning

Farming method that avoids synthetic chemicals and fertilizers, using natural methods instead.

Example

Organic farming improves soil health and reduces pollution.

有机农业改善了土壤健康并减少了污染。

B2 noun ˈɒksɪdʒən prəˈdʌkʃən

oxygen production

氧气生产

Meaning

The process of generating oxygen through photosynthesis or other means.

Example

Plants are vital for oxygen production and the maintenance of life.

植物对于氧气生产和维持生命至关重要。

B2 noun /ˈɒpəreɪtər/

operator

操作员

Meaning

a person who operates equipment, a business, or controls something

Example

The machine operator ensured that everything ran smoothly.

机器操作员确保一切顺利运行。

B2 noun ˈəʊ.və.hed

overhead

管理费用

Meaning

Ongoing business expenses not directly attributable to creating a product or service.

Example

The company reduced its overhead to increase profits.

公司减少了管理费用以增加利润。

B2 noun /ˈaʊtˌsɛt/

outset

开始

Meaning

the beginning or start of something

Example

From the outset, the project seemed ambitious but achievable.

从一开始，项目看起来雄心勃勃但可以实现。

B2 adjective /ˈɒp.ʃən.əl/

Optional

可选的

Meaning

not compulsory; left to choice

Example

Wearing a tie is optional for this event.

穿领带是这个活动的可选项。

B2 noun /ˈɒs.trɪtʃ/

Ostrich

鸵鸟

Meaning

a large flightless bird native to Africa with long legs and neck

Example

The ostrich is the world's largest bird.

鸵鸟是世界上最大的鸟。

B2 noun /ˈɔːrnəmənt/

ornament

装饰品

Meaning

A decorative object that adds beauty to something.

Example

The Christmas tree was decorated with colorful ornaments.

圣诞树上装饰着五颜六色的装饰品。

B2 verb /ˌoʊvərˈtɜrn/

overturn

推翻 / 取消裁决

Meaning

to turn something upside down or to reverse a decision or judgment

Example

The court decided to overturn the previous ruling.

法院决定推翻先前的裁决。

B2 verb /ˌoʊvərˈpeɪ/

overpay

支付过多

Meaning

To pay more than is necessary or reasonable.

Example

She realized she had overpaid for the concert tickets.

她意识到她为音乐会门票支付过多。

B2 noun /ɔːˈræŋ.ʊˌtæŋ/

Orang-Outang

猩猩

Meaning

a large arboreal ape with long reddish hair, long arms, and hooked hands and feet, native to Borneo and Sumatra

Example

The orangutan swings gracefully through the forest canopy.

猩猩优雅地穿越森林的树冠。

B2 noun /ˈaʊtɪŋ/

outing

短途旅行

Meaning

a short trip or excursion, often for leisure or enjoyment

Example

They had a lovely outing at the beach last weekend.

他们上周末在海滩上度过了一个美好的短途旅行。

B2 noun /ˈaʊtˌskɜːrt/

outskirt

城市郊区

Meaning

the outer edge or border of a town or city

Example

They built a new factory on the outskirts of the city.

他们在城市郊区建了一家新工厂。

B2 noun /ˈɔːɡən/

organ

器官

Meaning

a part of the body that performs a specific function

Example

The heart is an important organ in the human body.

心脏是人体重要的器官。

B2 noun/verb /ˈoʊvərˌdoʊs/

overdose

过量服药

Meaning

An excessive and dangerous amount of a drug; to take too much of a substance.

Example

He was rushed to the hospital after a drug overdose.

他因毒品过量被送进了医院。

B2 adjective /əˈpəʊzd/

opposed

反对的

Meaning

being against or in disagreement with something

Example

She is strongly opposed to animal testing.

她坚决反对动物实验。

B2 adverb /əˈfɪʃəli/

officially

正式地

Meaning

in a formal or authorized way

Example

The building was officially opened by the mayor.

这座建筑由市长正式开幕。

B2 adverb /ˈəʊvəli/

overly

过度

Meaning

to an excessive degree or extent

Example

She was overly concerned about the results.

她对结果过于担忧。

B2 noun /ˈɔːkɪstrə/

orchestra

管弦乐队

Meaning

a large group of musicians playing different instruments together

Example

The orchestra performed beautifully at the concert.

管弦乐队在音乐会上演奏得非常出色。

B2 noun /əbˈzɜːvər/

observer

观察者

Meaning

a person who watches or notices something

Example

The observer took notes during the meeting.

观察者在会议期间做了笔记。

B2 noun /ˈaʊtskɜːrts/

outskirts

城市边缘

Meaning

The outer parts of a town or city, away from the center.

Example

They moved to the outskirts of the city for a quieter life.

他们为了更安静的生活搬到了城市的边缘。

B2 adjective /ˌfæʃ.ənd/

Outdated

过时

Meaning

obsolete; no longer current

Example

This computer software is completely outdated.

这个软件完全过时了。

B2 verb /ˌoʊvərˈlʊk/

overlook

忽略

Meaning

to fail to notice or consider something; to have a view from above

Example

It's easy to overlook small details when you're in a hurry.

当你赶时间时，很容易忽略小细节。

B2 noun /ˌɔː.ri.enˈteɪ.ʃən/

orientation

定向

Meaning

the process of becoming familiar with a new situation or environment

Example

The company provides an orientation for all new employees.

公司为所有新员工提供定向培训。

B2 adjective /ˈaʊtˌɡoʊɪŋ/

outgoing

外向

Meaning

Friendly and sociable; inclined to mix with others.

Example

He is an outgoing person who loves meeting new people.

他是一个外向的人，喜欢结识新朋友。

B2 noun oʊˈbiː.sə.t̬i

obesity

肥胖症

Meaning

The condition of being grossly fat or overweight.

Example

Obesity increases the risk of diabetes and heart disease.

肥胖症增加糖尿病和心脏病的风险。

B2 adverb /ˈɒdli/

oddly

奇怪地

Meaning

in a strange or unusual way; unexpectedly

Example

Oddly, he didn’t seem upset by the bad news.

奇怪的是，他似乎并没有因为坏消息而难过。

B2 noun/verb /ˈaʊtreɪdʒ/

outrage

愤怒

Meaning

A strong feeling of anger and shock; to arouse anger or shock.

Example

The unfair decision caused public outrage.

不公正的决定引起了公众的愤怒。

B2 noun /ˌɒb.zəˈveɪ.ʃənz/

observations

观察

Meaning

The action or process of observing something carefully.

Example

Observations of distant galaxies provide new insights.

对遥远星系的观察提供了新的见解。

B2 verb /əˈfend/

offend

冒犯

Meaning

to cause displeasure or resentment; to hurt someone's feelings

Example

His rude comments offended many people at the meeting.

他的粗鲁评论冒犯了会议上的许多人。

B2 noun /əˈfens/

Offence

罪行; 侵犯法规

Meaning

a breach of law or rule; an annoyance or resentment

Example

Stealing is a serious offence punishable by law.

盗窃是严重的罪行，依法可追究。

B2 noun /ɑːks/

Ox

牛

Meaning

a large strong animal used for pulling heavy loads or plowing fields

Example

The farmer used an ox to plow the field.

农民用牛耕地。

B2 noun /ˈaʊt.kʌm/

Outcome

结果; 后果;

Meaning

the result or consequence of an action or situation; the final product

Example

The outcome of the election surprised everyone.

选举的结果让所有人感到惊讶。

Meaning

as a noun: a person who breaks the law and lives outside its protection; as a verb: to make something illegal

Example

The government decided to outlaw the harmful practice.

B2 adjective /ˈɔː.rəl/

Oral

口头的；与嘴巴相关的

Meaning

spoken rather than written; relating to the mouth

Example

The oral examination will test your speaking skills.

口头考试将测试你的口语技能。

B2 verb /ˈɒkjʊpaɪ/

occupy

占据

Meaning

to take up space or time; to live or work in a place

Example

The new family will occupy the house next month.

新家庭将于下个月入住这所房子。

B2 noun /ˈɔːɡənɪzəm/

organism

有机体

Meaning

a living thing that has an organized structure and can grow and reproduce

Example

Every organism needs water to survive.

每个有机体都需要水才能生存。

B2 noun /ˈoʊ.vər ɡroʊθ/

Over growth

过度生长

Meaning

excessive growth beyond normal size; too much development or expansion

Example

The overgrowth of weeds made the garden look untidy.

杂草的过度生长让花园显得不整洁。

B2 verb /əˈblaɪdʒ/

oblige

迫使

Meaning

to compel or require someone to do something; to help or do a favor

Example

I would be happy to oblige you with the information you need.

我很乐意为你提供所需的信息。

B2 noun /əˌrɪʒ.əˈnæl.ə.ti/

Originality

原创性

Meaning

the quality of being novel or unusual; the ability to think independently and creatively

Example

The artist's work showed great originality and creativity.

艺术家的作品展示了极大的原创性和创造力。

B2 noun /ˈɔr.fən.ɪʒ/

Orphanage

孤儿院

Meaning

an institution for the care and education of children who have lost their parents

Example

The charity built a new orphanage for homeless children.

慈善机构为无家可归的孩子建了一个新孤儿院。

B2 verb /ˌoʊvərˈduː/

overdo

做得过火

Meaning

to do something too much; to exaggerate or carry to excess

Example

Don't overdo the exercise on your first day at the gym.

第一天去健身房时不要运动过度。

B2 verb /ˌoʊvərˈteɪk/

overtake

超过

Meaning

to catch up with and pass someone or something; to surpass

Example

The runner managed to overtake his competitor in the final lap.

跑步者在最后一圈超过了他的竞争对手。

B2 adjective /ˌɑːp.təˈmɪs.tɪk/

optimistic

乐观的

Meaning

hopeful and confident about the future

Example

She is optimistic about the success of her new project.

她对新项目的成功持乐观态度。

B2 adjective /əˈfen.sɪv/

Offensive

冒犯的; 侮辱的; 攻击性的

Meaning

causing displeasure or resentment; insulting; aggressive

Example

His offensive remarks hurt everyone's feelings.

他的冒犯言论伤害了每个人的感情。

B2 noun /ˈɒp.tɪ.mɪ.zəm/

optimism

乐观

Meaning

Hopefulness and confidence about the future or the successful outcome of something.

Example

Her optimism helped her overcome difficult times.

她的乐观帮助她克服了困难的时光。

B2 noun /ˈɒt.ər/

Otter

水獺

Meaning

a mammal with webbed feet that lives near water and feeds on fish

Example

The playful otter swam gracefully in the river.

顽皮的水獺优雅地在河里游泳。

B2 noun /ˈaʊtˌfɪt/

outfit

服装

Meaning

A set of clothes worn together, often for a particular occasion.

Example

She wore a beautiful outfit to the party.

她穿了一套漂亮的服装去参加派对。

B2 verb /oʊˈmɪt/

omit

遗漏

Meaning

to leave out or exclude; to fail to include something

Example

Please don't omit any important details from your report.

请不要遗漏报告中的重要细节。

B2 noun /ˈɒkjʊpənt/

occupant

乘客

Meaning

A person who resides in or is present in a house, vehicle, seat, or place.

Example

The car had three occupants at the time of the accident.

事故发生时，车上有三名乘客。

B2 noun /ˈoʊ.dər/

Odour

气味

Meaning

a distinctive smell, especially an unpleasant one

Example

The odour of fresh bread filled the kitchen.

新鲜面包的气味充满了厨房。

选择

Meaning

to choose or decide to do something instead of something else

Example

Many students opt to study abroad for better opportunities.

许多学生选择出国留学以获得更好的机会。