A2 preposition /ˈɒntu/

onto

在…上

Meaning

moving to a position on the surface of something

Example

She jumped onto the table to get the book.

她跳到桌子上去拿书。

C1 noun /ˈɔːrθədɑːksi/

orthodoxy

正统

Meaning

traditional or generally accepted beliefs and practices

Example

The religious leader defended the orthodoxy of the faith.

宗教领袖捍卫了信仰的正统性。

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 /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。

B1 verb /əˈkɜːr/

occur

发生

Meaning

to happen or take place; to be found or present

Example

The accident occurred at the intersection during rush hour.

事故发生在高峰时段的交叉口。

C2 verb /oʊˈpaɪn/

opine

表达意见

Meaning

to express an opinion or belief

Example

The professor opined that the policy would fail.

教授认为政策会失败。

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。

B1 adverb /əˈkeɪʒənəli/

Occasionally

偶尔; 有时;

Meaning

sometimes; from time to time; not regularly

Example

I occasionally visit my grandmother on weekends.

我偶尔在周末去看望我的祖母。

C1 adjective /ˌɑːpərˈtuːn/

opportune

合适的时刻

Meaning

Happening at a suitable or convenient time.

Example

She arrived at an opportune moment to help.

她在合适的时刻到达，准备帮助。

B1 adjective /əˈrɪdʒ.ɪ.nəl/

Original

原始的; 主要的; 真实的

Meaning

first; fundamental; primary; authentic

Example

This is the original document, not a copy.

这是原始文件，不是副本。

A2 adjective /ˈaʊtdɔːr/

outdoor

户外

Meaning

situated, existing, or done outside a building

Example

We planned an outdoor picnic for the weekend.

我们计划了一个户外野餐，周末进行。

C2 noun /ˌɑːbdʒərˈɡeɪʃən/

objurgation

严厉的斥责

Meaning

a harsh scolding or strong rebuke

Example

His misconduct earned him a severe objurgation from the manager.

他的不当行为让他受到了经理的严厉斥责。

B2 noun /əbˈdʒek.ʃən/

Objection

反对; 异议; 抗议;

Meaning

an expression of disagreement or disapproval; a reason for disagreeing

Example

The lawyer raised an objection during the trial.

律师在审判过程中提出了异议。

C1 verb /ˌaʊtˈweɪ/

outweigh

比...更重要

Meaning

To be more important, valuable, or significant than something else.

Example

The benefits of the new policy outweigh the risks.

新政策的好处超过了风险。

C1 adjective ˈɒk.sɪ.də.tɪv

oxidative

与氧化相关

Meaning

Related to or caused by oxidation, especially cellular damage from free radicals.

Example

Excess stress can lead to oxidative damage in cells.

过度的压力可能导致细胞中的氧化损伤。

B2 noun /ɒpˈtɪʃən/

optician

眼镜师

Meaning

A person who makes or sells glasses and contact lenses.

Example

The optician adjusted my new glasses to fit better.

眼镜师调整了我的新眼镜，以便更好地适应。

B2 noun /ˈɔːrɡənaɪzər/

organizer

组织者

Meaning

a person who arranges or coordinates activities, events, or groups; a tool or item used to keep things in order

Example

She worked as the main organizer of the international conference.

她是这次国际会议的主要组织者。

A2 noun /ˈɒm.lət/

Omelet

煎蛋饼

Meaning

a dish made from beaten eggs cooked in a frying pan and often folded around a filling

Example

She made a cheese omelet for breakfast.

她做了一个奶酪煎蛋饼作为早餐。

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 /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。

C1 adjective /əbˈtjuːs/

Obtuse

迟钝的; 愚笨的; 理解慢

Meaning

annoyingly insensitive or slow to understand; lacking in intelligence or perception

Example

He was being deliberately obtuse about the instructions.

他故意在指令上表现得迟钝。

A1 interjection /oʊ/

oh

哦

Meaning

used to express surprise, realization, or understanding

Example

Oh, I didn't know you were here!

哦，我不知道你在这里！

C1 noun /ˌəʊvərɪksˌplɔɪˈteɪʃən/

overexploitation

过度开发

Meaning

The unsustainable use of natural resources at a rate that exceeds their ability to regenerate, leading to depletion and environmental degradation.

Example

Overexploitation of natural resources leads to environmental degradation.

过度开发自然资源会导致环境退化。

B1 verb /oʊ/

owe

欠债

Meaning

to be under obligation to pay or repay; to be indebted

Example

I owe my success to my parents' support.

我将我的成功归功于父母的支持。

C1 adjective /ɒmˈnɪv.ər.əs/

Omnivorous

杂食性动物

Meaning

eating both plants and animals; feeding on various kinds of food

Example

Bears are omnivorous animals that eat both plants and meat.

熊是杂食性动物，吃植物和肉。

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 /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。

C1 adjective əˈblɪv.i.əs

oblivious

无意识的

Meaning

Being completely unaware of surrounding events.

Example

He was oblivious to the noise around him while reading.

他在阅读时完全没有意识到周围的噪音。

C2 noun /ˌɒstɛnˈteɪʃən/

ostentation

炫耀

Meaning

excessive display of wealth or knowledge intended to attract admiration or envy

Example

The billionaire’s party was full of ostentation and luxury.

亿万富翁的派对充满了炫耀和奢华。

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。

C1 adjective /əˈprɛs.ɪv/

Oppressive

压迫的

Meaning

Harsh and authoritarian; overwhelming; causing distress; tyrannical;

Example

The oppressive heat made it difficult to work outside during the summer.

压迫性的热浪使得夏天在外工作变得很困难。

C1 adjective /ˌɒstɛnˈteɪʃəs/

ostentatious

炫耀的

Meaning

Characterized by a showy or pretentious display intended to impress others.

Example

He wore an ostentatious gold chain to the party.

他在派对上戴着一条炫耀的金链子。

C1 noun /ˈɒn.slɔːt/

onslaught

猛攻

Meaning

A fierce or destructive attack.

Example

The village faced an onslaught of enemy forces.

这个村庄面临敌军的猛烈进攻。

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。

C2 noun ˈɒpjʊləns

opulence

奢华

Meaning

Great wealth or luxuriousness.

Example

The opulence of the mansion was evident in its ornate furnishings.

大厦的奢华体现在其华丽的家具中。

B1 noun /ˈɒbstəkəlz/

obstacles

障碍

Meaning

Things that block one's way or prevent or hinder progress.

Example

Obstacles in life can often lead to valuable lessons.

生活中的障碍常常导致宝贵的教训。

B2 noun ˈaʊt.pʊt

output

产量

Meaning

The amount of something produced by a person, machine, or industry.

Example

Climate change reduces agricultural output.

气候变化减少农业产量。

C2 noun /ˈɒkjʊlɪst/

oculist

眼科医生

Meaning

An old-fashioned term for an eye doctor or ophthalmologist.

Example

The village oculist was known for treating various eye diseases.

村里的眼科医生以治疗各种眼病而闻名。

C2 noun /ˈoʊ.kəm/

oakum

旧绳纤维

Meaning

loose fibers obtained by untwisting old ropes, used for caulking ships

Example

The shipbuilders used oakum to seal the gaps in the wooden planks.

造船工人使用欧卡姆来密封木板之间的缝隙。

B2 noun /ˌɑb.lɪˈɡeɪ.ʃən/

Obligation

义务

Meaning

a duty or commitment; something that must be done legally or morally

Example

Parents have an obligation to care for their children.

父母有责任照顾他们的孩子。

C2 adjective /əbˈstrɛpərəs/

obstreperous

喧闹且难以控制

Meaning

Noisy and difficult to control.

Example

The obstreperous students disrupted the class.

那些喧闹的学生打乱了课堂。

C2 verb /ˌoʊvərˈliːp/

overleap

跳过

Meaning

To jump over something; to omit or disregard something.

Example

He managed to overleap the fence easily.

他轻松地越过了栅栏。

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。

C1 noun ˈoʊʃən əˌsɪdɪfɪˈkeɪʃən

ocean acidification

海洋酸化

Meaning

The ongoing decrease in the pH of the Earth's oceans, caused by the absorption of carbon dioxide from the atmosphere.

Example

Ocean acidification is caused by atmospheric CO2 absorption.

海洋酸化是由大气中CO2的吸收引起的。

C2 noun /ˈɒrɪz(ə)n/

orison

祷告

Meaning

a prayer, especially a devout or formal one

Example

He whispered a quiet orison before going to sleep.

他在睡觉前低声祈祷。

C1 adjective /ˌɒbsəˈliːt/

obsolete

过时的

Meaning

No longer in use or out of date.

Example

Floppy disks are now completely obsolete.

软盘现在完全过时了。

C2 adjective /əbˈsiːkwɪəs/

obsequious

奉承

Meaning

Excessively obedient or attentive in a servile way.

Example

The waiter gave an obsequious bow to every customer.

服务员对每个顾客鞠了一躬。

C1 adjective /ˈɔːrdɪnəl/

ordinal

序数

Meaning

Relating to the order or position of something in a sequence (first, second, third, etc.).

Example

The ordinal number 'third' indicates position in a sequence.

序数词'第三'表示在顺序中的位置。

C1 adjective /əˈbliːk/

Oblique

倾斜; 对角线; 间接或回避

Meaning

slanting; diagonal; indirect or evasive

Example

The artist drew an oblique line across the canvas.

艺术家在画布上画了一条倾斜的线。

A2 adverb; noun /ˌaʊtˈdɔːrz/

outdoors

在户外

Meaning

outside a building; the natural environment outside

Example

We spent the whole afternoon outdoors enjoying the fresh air.

我们整个下午都在户外享受新鲜空气。

A1 adjective/adverb /ˈoʊnli/

only

唯一

Meaning

without others; solely

Example

He is the only person who knows the secret.

他是唯一知道这个秘密的人。

A1 adjective /ˈʌðər/

other

其他

Meaning

used to refer to something different from the one already mentioned or known

Example

I don't want this one, I will take the other one.

我不想要这个，我会拿另一个。

C2 adjective /ˈɑːsɪˌfaɪd/

ossified

变成骨头，僵硬

Meaning

Turned into bone or become rigid; unwilling to change.

Example

The company had an ossified management structure that resisted innovation.

该公司有一个僵化的管理结构，抵制创新。

C2 adjective /ˈɒsiəs/

osseous

骨质的

Meaning

consisting of or turned into bone; bony

Example

The fossil showed osseous structures of the ancient creature.

化石展示了古老生物的骨质结构。

C2 noun /ˈɔːrdnəns/

ordnance

军火

Meaning

Military supplies including weapons, ammunition, and combat equipment.

Example

The army stored ordnance in a secure facility outside the city.

军队在城市外的一个安全设施中存储军火。

C1 adjective /əbˈsɛsɪv/

obsessive

强迫症的

Meaning

Relating to or characterized by an obsession; thinking about something too much.

Example

He has an obsessive interest in cleanliness.

他对清洁有强迫症的兴趣。

B1 noun ˌɔː.ɡən.aɪˈzeɪ.ʃənz

organizations

组织

Meaning

Organized groups of people with a particular purpose

Example

Organizations play a key role in policymaking.

组织在政策制定中发挥着重要作用。

A2 noun /ˈoʊ.ʃən/

ocean

海洋

Meaning

A very large expanse of sea, especially the main areas of sea between continents.

Example

The ocean covers more than 70% of the Earth's surface.

海洋覆盖了地球表面超过70%。

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。

C2 noun ˈoʊʃən ˌstrætɪfɪˈkeɪʃən

ocean stratification

海洋分层

Meaning

The formation of layers in ocean water due to differences in density.

Example

Ocean stratification affects marine biodiversity.

海洋分层影响海洋生物多样性。

B1 adjective /ˈɔːɡənaɪzd/

organized

有条理的

Meaning

Arranged in a systematic way, especially on a large scale.

Example

An organized approach to work increases productivity and reduces stress.

有条理的工作方法可以提高生产力并减少压力。

C1 verb /ˈɒp.tɪ.maɪz/

optimize

优化

Meaning

To make the best or most effective use of a situation, opportunity, or resource.

Example

The company is working to optimize its supply chain.

公司正在努力优化其供应链。

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 noun /ˈɔɪ.stər/

Oyster

生蚝

Meaning

a type of shellfish that can be eaten and sometimes contains pearls

Example

She ordered fresh oysters at the seafood restaurant.

她在海鲜餐厅点了新鲜的生蚝。

C2 adjective /əˈrækjələr/

oracular

神谕的

Meaning

Resembling an oracle; giving wise, mysterious, or prophetic statements

Example

Her oracular words left the audience deep in thought.

她的神谕般的话让观众陷入了深思。

C1 adverb /ˈaʊtwədli/

Outwardly

表面上; 外观上;

Meaning

on the surface; externally; in appearance

Example

Outwardly, he seemed calm, but inside he was nervous.

表面上，他看起来很冷静，但内心却很紧张。

C1 noun /ˌɑːsɪˈleɪʃən/

oscillation

摆动

Meaning

The movement back and forth at a regular speed.

Example

The oscillation of the pendulum controls the clock.

摆锤的摆动控制着时钟。

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。

C1 verb /aʊst/

oust

驱逐

Meaning

To remove someone from a position or place of power or authority.

Example

The rebels ousted the dictator from power.

叛乱者将独裁者赶下台。

B1 noun /əˈkeɪ.ʒən/

Occasion

场合; 特殊事件

Meaning

a particular time or instance of an event; a special celebration

Example

Their wedding was a joyous occasion.

他们的婚礼是一个喜庆的场合。

C2 noun /ˌɔːrdɪˈneɪʃən/

ordination

任职

Meaning

The ceremony of conferring holy orders or official religious authority.

Example

The church held a special service for the ordination of new priests.

教堂为新神父举行了一个特别的服务，进行圣职任命。

C1 adjective /ˌɒmnɪˈprezənt/

omnipresent

无所不在

Meaning

(of God) present everywhere at the same time.

Example

Social media has become an omnipresent force in modern society.

社交媒体已成为现代社会中无所不在的力量。

A2 noun /ˈoʊ.nər/

Owner

所有者

Meaning

a person who owns something; someone who has legal possession of property

Example

The owner of the restaurant greeted us warmly.

餐厅的所有者热情地迎接了我们。

C1 noun /ˈɒstrəsɪzəm/

ostracism

排斥

Meaning

The act of excluding someone from a group or society.

Example

The student faced ostracism after breaking the rules.

学生在违反规则后遭受了排斥。

C1 adjective /ɔːˈneɪt/

ornate

华丽的

Meaning

elaborately or highly decorated

Example

The palace hall was filled with ornate furniture and paintings.

宫殿的大厅里充满了华丽的家具和画作。

C2 noun /oʊd/

ode

颂诗

Meaning

a lyrical poem, often expressing praise or strong emotions

Example

The poet wrote an ode to the beauty of nature.

诗人写了一首歌颂自然美的颂诗。

A1 preposition, adverb /ˈoʊvər/

over

在…上面

Meaning

across, on top of, or beyond

Example

The book is lying over the table.

书在桌子上面。

B1 noun /ˈɑp.ʃən/

Option

选项

Meaning

a thing that is or may be chosen; an alternative course of action

Example

You have the option to work from home or office.

你可以选择在家工作或在办公室工作。

C1 noun /ˈɔːr.ə.tɔːr.i/

oratory

演讲艺术

Meaning

The art of public speaking; skilled and confident delivery of speeches to an audience.

Example

His exceptional oratory skills won him the debate competition.

他出色的演讲技巧使他赢得了辩论比赛。

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 /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。

A1 pronoun /ˈʌðərz/

others

其他

Meaning

people or things distinct from the ones already mentioned or known

Example

I like to spend time with others.

我喜欢和其他人一起度过时间。

A1 preposition /ʌv/

of

的

Meaning

expressing the relationship between a part and a whole

Example

The book is on the table, in front of the window.

书在桌子上，在窗户前。

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 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 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。

C1 adjective ˈɒptɪmaɪzd

optimized

优化, 改善, 更有效

Meaning

Made as fully perfect, functional, or effective as possible; improved to achieve maximum efficiency.

Example

The system has been optimized for faster performance.

系统已经针对更快的性能进行了优化。

C2 noun /ˈɑb.lə.kwi/

Obloquy

严厉的批评或言语侮辱；公开谴责

Meaning

harsh criticism or verbal abuse; strong public condemnation

Example

The politician faced obloquy after the scandal.

政治家在丑闻之后遭遇了严厉的批评。

C1 adjective /ˈɒm.ɪ.nəs/

Ominous

不祥的; 威胁的

Meaning

giving the impression that something bad will happen; threatening; foreboding

Example

The dark clouds looked ominous before the storm.

暴风雨前，黑云看起来预示着灾难。

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。

B1 verb অকার্স

occurs

发生

Meaning

Happens or takes place, especially as a result of something.

Example

Snowfall occurs in regions with freezing temperatures.

在气温低于零度的地区会发生降雪。

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。

C1 noun /ˈɔr.ə.tər/

Orator

演说家

Meaning

a public speaker, especially one who is eloquent or skilled in speaking

Example

The famous orator delivered an inspiring speech.

这位著名的演说家发表了一场鼓舞人心的演讲。

C2 noun /ˌɒn.əˌmæt.əˈpiː.ə/

onomatopoeia

拟声词

Meaning

The formation of a word from a sound associated with what is named.

Example

The word 'buzz' is an example of onomatopoeia.

‘buzz’ 这个词是拟声词的一个例子。

A1 adverb /wʌns/

Once

一次; 过去的某个时候

Meaning

one time only; at some time in the past; formerly

Example

I have been to Paris once in my life.

我一生中只去过一次巴黎。

C2 adjective /ˌɔːfˈkiː/

off-key

跑调

Meaning

out of tune; not in accordance with expected standards

Example

The singer was slightly off-key during the performance.

歌手在表演时稍微跑调了。

C2 adjective /ˈɒfɪʃ/

offish

冷淡

Meaning

Unfriendly, distant, or reserved in manner.

Example

He seemed offish at the party and avoided most conversations.

他在派对上显得很冷淡，避开了大多数谈话。

C1 adjective /əbˈstrʌk.tɪv/

Obstructive

阻碍性的

Meaning

deliberately creating difficulties or preventing progress; hindering or blocking something

Example

The obstructive policies hindered economic growth.

这些阻碍性的政策阻碍了经济增长。

B1 verb /ˈɒpəreɪtɪŋ/

operating

操作

Meaning

to control or manage the functioning of something

Example

The company has been operating in this market for five years.

公司已经在这个市场运营了五年。

C1 noun /ˈaʊtriːtʃ/

outreach

援助扩展

Meaning

The act of providing services or support to people who might not otherwise have access to them.

Example

The charity launched a new outreach program for the homeless.

慈善机构为无家可归的人推出了一个新的援助扩展计划。

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。