O 開頭的英文單字：150+ 個常用單字、慣用語及練習方法

O 開頭的英文單字

音標

中文意思

例句

Ocean

/ˈoʊ.ʃən/

海洋

The ocean covers more than seventy percent of our planet. (海洋覆蓋了我們星球超過百分之七十的面積。)

Office

/ˈɔː.fɪs/

辦公室

My new office is located on the fifteenth floor of the building. (我的新辦公室位於大樓的15樓。)

Opinion

/əˈpɪn.jən/

意見

I would like to hear your opinion about this important matter. (我想聽聽你對這個重要事項的意見。)

Opportunity

/ˌɒp.əˈtjuː.nə.ti/

機會

This job offers a great opportunity for career advancement and growth. (這份工作提供了很好的職業晉升和成長機會。)

Option

/ˈɒp.ʃən/

選擇

We have several options for dinner tonight, what do you prefer? (我們今晚有幾個晚餐選擇，你喜歡哪個？)

Orange

/ˈɒr.ɪndʒ/

橙子

I usually enjoy eating an orange after my morning workout routine. (我通常喜歡在晨練後吃一個橙子。)

Order

/ˈɔː.dər/

順序；命令；訂單

The waiter took our order and promised it would arrive quickly. (服務生記下了我們的點餐並承諾會很快送達。)

Organ

/ˈɔː.ɡən/

器官

The heart is one of the most vital organs in our body. (心臟是我們身體中最重要的器官之一。)

Organization

/ˌɔː.ɡən.aɪˈzeɪ.ʃən/

組織

She works for an international organization that helps children in need. (她在一個幫助需要幫助的兒童的國際組織工作。)

Origin

/ˈɒr.ɪ.dʒɪn/

起源

The origin of this traditional festival dates back five hundred years. (這個傳統節日的起源可以追溯到五百年前。)

Ounce

/aʊns/

盎司

The recipe calls for two ounces of chocolate and one cup sugar. (這個食譜需要兩盎司巧克力和一杯糖。)

Outcome

/ˈaʊt.kʌm/

結果

Nobody could have predicted the surprising outcome of the championship match. (沒有人能預測到錦標賽的驚人結果。)

Outline

/ˈaʊt.laɪn/

大綱

Before writing the essay, I prepared a detailed outline of topics. (在寫論文前，我準備了一個詳細的主題大綱。)

Output

/ˈaʊt.pʊt/

產出

The factory has increased its output by thirty percent this year. (該工廠今年增加了百分之三十的產量。)

Oven

/ˈʌv.ən/

烤箱

She baked the chocolate chip cookies in the oven for fifteen minutes. (她在烤箱裡烤了十五分鐘的巧克力餅乾。)

Overtime

/ˈoʊ.vər.taɪm/

加班時間

Many employees have to work overtime to finish the project deadline. (許多員工必須加班才能完成專案期限。)

Owner

/ˈoʊ.nər/

所有者

The owner of the restaurant greeted us warmly when we arrived. (當我們到達時，餐廳老闆熱情地迎接我們。)

Oxygen

/ˈɒk.sɪ.dʒən/

氧氣

Plants produce oxygen through photosynthesis, which humans need to breathe. (植物通過光合作用產生人類呼吸所需的氧氣。)

Oyster

/ˈɔɪ.stər/

牡蠣

We ordered a dozen fresh oysters at the seafood restaurant yesterday. (我們昨天在海鮮餐廳點了一打新鮮牡蠣。)

Oatmeal

/ˈoʊt.miːl/

燕麥片

I start most mornings with a warm bowl of oatmeal and berries. (大多數早晨，我都以一碗溫熱的燕麥片和漿果開始一天。)

Oath

/oʊθ/

誓言

The new citizens took an oath of allegiance to their adopted country. (新公民向他們的收養國宣誓效忠。)

Obligation

/ˌɒb.lɪˈɡeɪ.ʃən/

義務

We all have an obligation to protect our environment for future generations. (我們都有義務為子孫後代保護我們的環境。)

Observatory

/əbˈzɜː.və.tər.i/

天文台

The observatory offers a perfect view of the stars and planets. (天文台提供了觀賞星星和行星的絕佳視角。)

Obstacle

/ˈɒb.stə.kəl/

障礙

She overcame many obstacles to achieve her dream of becoming doctor. (她克服了許多障礙實現了成為醫生的夢想。)

Occasion

/əˈkeɪ.ʒən/

場合

We should dress formally for this special occasion this weekend. (我們這個週末應該為這個特殊場合正式著裝。)

Occupation

/ˌɒk.jʊˈpeɪ.ʃən/

職業

Teaching has been her occupation for more than twenty years now. (教學已經成為她二十多年的職業了。)

Occurrence

/əˈkʌr.əns/

發生

Earthquakes are a common occurrence in this region of the country. (地震在這個國家地區是常見的現象。)

Ocean

/ˈoʊ.ʃən/

海洋

The Pacific Ocean is the largest and deepest of Earth's oceanic divisions. (太平洋是地球上最大、最深的海洋。)

Octopus

/ˈɒk.tə.pəs/

章魚

The octopus is considered one of the most intelligent invertebrate animals. (章魚被認為是最聰明的無脊椎動物之一。)

Odor

/ˈoʊ.dər/

氣味

An unusual odor was coming from the kitchen this morning. (今天早上廚房裡飄來一股不尋常的氣味。)

Offence

/əˈfens/

罪行

He was charged with the offence of driving without valid license. (他被控以無有效駕照駕駛的罪名。)

Offering

/ˈɒf.ər.ɪŋ/

提供物

The company's new product offering has been very well received. (該公司的新產品供應受到了很好的歡迎。)

Officer

/ˈɒf.ɪ.sər/

軍官；警官

The police officer helped the lost child find his parents quickly. (警察幫助迷路的孩子快速找到了他的父母。)

Official

/əˈfɪʃ.əl/

官員

The official statement about the incident will be released tomorrow morning. (關於該事件的官方聲明將於明天上午發布。)

Oil

/ɔɪl/

油

Olive oil is widely used in Mediterranean cooking and cuisine. (橄欖油在地中海烹飪和菜餚中被廣泛使用。)

Omelet

/ˈɒm.lət/

蛋捲

She makes a delicious omelet with cheese and fresh vegetables. (她用奶酪和新鮮蔬菜做了一個美味的蛋捲。)

Opera

/ˈɒp.ər.ə/

歌劇

We attended a wonderful opera at the national theater last night. (昨晚我們在國家劇院欣賞了一場精彩的歌劇。)

Operation

/ˌɒp.əˈreɪ.ʃən/

手術；操作

The doctor explained every detail of the operation to the patient. (醫生向病人解釋了手術的每一個細節。)

Opponent

/əˈpoʊ.nənt/

對手

She respects her opponent despite their intense rivalry on court. (儘管在球場上有激烈的競爭，她仍然尊重她的對手。)

O 開頭的英文單字

音標

中文意思

例句

Obey

/əˈbeɪ/

服從

Children must learn to obey the safety rules when crossing streets. (孩子們必須學會在過馬路時遵守安全規則。)

Object

/əbˈdʒekt/

反對

I strongly object to any proposal that would harm the environment. (我強烈反對任何會傷害環境的提議。)

Observe

/əbˈzɜːrv/

觀察

Scientists observe animal behavior in their natural habitat for research purposes. (科學家為研究目的觀察動物在自然棲息地的行為。)

Obtain

/əbˈteɪn/

獲得

You need to obtain a permit before starting any construction work. (在開始任何建築工作前，您需要獲得許可證。)

Occupy

/ˈɒk.jʊ.paɪ/

佔據

The protestors decided to occupy the main square for three days. (抗議者決定佔據主廣場三天。)

Occur

/əˈkɜːr/

發生

Earthquakes often occur along the boundaries of tectonic plates globally. (地震通常發生在全球板塊邊界附近。)

Offend

/əˈfend/

冒犯

I did not mean to offend you with my careless remark. (我並不是有意用我的不經意的言論冒犯你。)

Offer

/ˈɒf.ər/

提供

The company decided to offer free shipping on all online orders. (該公司決定對所有網上訂單提供免費送貨服務。)

Open

/ˈoʊ.pən/

打開

Could you please open the window to let some fresh air? (你能打開窗戶讓一些新鮮空氣進來嗎？)

Operate

/ˈɒp.ər.eɪt/

操作

Not everyone knows how to operate this complex new machinery correctly. (不是每個人都知道如何正確操作這種複雜的新機器。)

Oppose

/əˈpoʊz/

反對

Many local residents oppose the construction of the new highway. (許多當地居民反對新高速公路的建設。)

Oppress

/əˈpres/

壓迫

Dictators throughout history have tried to oppress those who disagree. (歷史上的獨裁者試圖壓迫那些持不同意見的人。)

Opt

/ɒpt/

選擇

Many students opt to continue their studies abroad after graduation. (許多學生在畢業後選擇繼續到國外深造。)

Optimize

/ˈɒp.tɪ.maɪz/

優化

The team worked to optimize the website for better performance. (團隊致力於優化網站以獲得更好的性能。)

Order

/ˈɔː.dər/

命令；訂購

The general will order the troops to move at dawn tomorrow. (將軍將命令部隊明天黎明時出發。)

Organize

/ˈɔːr.ɡə.naɪz/

組織

We need to organize our schedule better to meet all deadlines. (我們需要更好地組織我們的日程安排以滿足所有截止日期。)

Originate

/əˈrɪdʒ.ə.neɪt/

起源

This particular dance style originated in the southern regions centuries ago. (這種特殊的舞蹈風格在幾個世紀前起源於南部地區。)

Oscillate

/ˈɒs.ə.leɪt/

擺動

The fan blades oscillate to distribute cool air throughout the room. (風扇葉片擺動以在整個房間分配涼爽的空氣。)

Outline

/ˈaʊt.laɪn/

概述

The professor will outline the main topics of the course today. (教授今天將概述課程的主要主題。)

Outperform

/ˌaʊt.pərˈfɔːrm/

表現更好

Our company continues to outperform competitors in the market consistently. (我們公司繼續在市場上持續表現優於競爭對手。)

Outrun

/ˌaʊtˈrʌn/

跑得比...快

The cheetah can outrun most other animals on the African savanna. (獵豹能比非洲草原上的大多數其他動物跑得更快。)

Outsource

/ˈaʊt.sɔːrs/

外包

Many companies outsource their customer service to reduce operational costs. (許多公司外包其客戶服務以降低運營成本。)

Outweigh

/ˌaʊtˈweɪ/

比...更重要

The benefits of exercise far outweigh the temporary discomfort it causes. (運動的好處遠遠超過它所引起的暫時不適。)

Overcome

/ˌoʊ.vərˈkʌm/

克服

She managed to overcome her fear of public speaking through practice. (她通過練習成功克服了她對公開演講的恐懼。)

Overlap

/ˌoʊ.vərˈlæp/

重疊

Our work schedules overlap only on Tuesdays and Thursday mornings. (我們的工作時間表只在星期二和星期四上午重疊。)

Overlook

/ˌoʊ.vərˈlʊk/

忽視；俯瞰

Don't overlook the small details when planning your important presentation. (規劃重要演講時，不要忽視小細節。)

Override

/ˌoʊ.vərˈraɪd/

否決

The president can override the decision with his executive power. (總統可以用他的行政權力否決這個決定。)

Oversee

/ˌoʊ.vərˈsiː/

監督

The manager will oversee the entire project from start to finish. (經理將從頭到尾監督整個項目。)

Overtake

/ˌoʊ.vərˈteɪk/

超過

The faster car managed to overtake us on the highway easily. (那輛更快的車在高速公路上輕鬆地超過了我們。)

Overthrow

/ˌoʊ.vərˈθroʊ/

推翻

The rebels attempted to overthrow the government but ultimately failed. (叛亂分子試圖推翻政府，但最終失敗了。)

Overuse

/ˌoʊ.vərˈjuːz/

過度使用

Try not to overuse certain words when writing your essay. (寫論文時盡量不要過度使用某些詞。)

Overwhelm

/ˌoʊ.vərˈwelm/

壓倒

The amount of work can sometimes overwhelm even the most organized person. (工作量有時甚至會壓垮最有條理的人。)

Owe

/oʊ/

欠

I still owe my brother money for the concert tickets last month. (我仍然欠我兄弟上個月音樂會門票的錢。)

Own

/oʊn/

擁有

My grandparents own a small farm in the countryside near mountains. (我祖父母在靠近山區的鄉下擁有一個小農場。)

Oxidize

/ˈɒk.sɪ.daɪz/

氧化

Iron will oxidize and form rust when exposed to air. (鐵暴露在空氣中會氧化並形成鏽。)

Obfuscate

/ˈɒb.fʌs.keɪt/

混淆

Politicians sometimes obfuscate the truth to avoid difficult questions from reporters. (政治家有時會混淆事實以避免記者的難題。)

Obligate

/ˈɒb.lɪ.ɡeɪt/

迫使

The contract will obligate both parties to maintain strict confidentiality. (合約將迫使雙方保持嚴格的保密性。)

Obliterate

/əˈblɪt.ər.eɪt/

摧毀

The bomb blast could obliterate buildings within a one-mile radius. (炸彈爆炸可能摧毀方圓一英里內的建築物。)

Observe

/əbˈzɜːrv/

遵守；觀察

Please observe all safety regulations when operating heavy machinery equipment. (操作重型機械設備時請遵守所有安全規定。)

Obsess

/əbˈses/

迷戀

He tends to obsess over small details that others might ignore. (他傾向於迷戀於其他人可能會忽視的小細節。)

O 開頭的英文單字

音標

中文意思

例句

Obedient

/əˈbiː.di.ənt/

服從的

The well-trained dog is obedient to all of his owner's commands. (訓練有素的狗對主人的所有命令都很服從。)

Obese

/oʊˈbiːs/

肥胖的

Doctors recommend regular exercise to patients who are clinically obese. (醫生建議臨床肥胖的患者定期運動。)

Objective

/əbˈdʒek.tɪv/

客觀的

The judge must remain objective when evaluating all competition entries. (評委在評估所有參賽作品時必須保持客觀。)

Obligatory

/əˈblɪɡ.ə.tɔːr.i/

強制性的

Wearing helmets is obligatory for all cyclists under sixteen years old. (所有十六歲以下的騎自行車者都必須戴頭盔。)

Oblique

/əˈbliːk/

斜的

He made an oblique reference to the scandal without mentioning names. (他對醜聞進行了間接的提及，沒有提及姓名。)

Obscure

/əbˈskjʊər/

模糊的；晦澀的

The professor specializes in translating obscure ancient texts from Latin. (教授專門翻譯拉丁文的晦澀古文。)

Observant

/əbˈzɜːr.vənt/

觀察力敏銳的

The observant detective noticed a small detail everyone else missed. (觀察力敏銳的偵探注意到了其他人都錯過的小細節。)

Obsolete

/ˌɒb.səˈliːt/

過時的

This technology will soon become obsolete as newer versions develop. (隨著新版本的發展，這項技術很快就會過時。)

Obstinate

/ˈɒb.stɪ.nət/

固執的

His obstinate refusal to compromise led to breakdown in negotiations. (他固執地拒絕妥協導致談判破裂。)

Obvious

/ˈɒb.vi.əs/

明顯的

It was obvious from her smile that she had received good news. (從她的微笑可以明顯看出她收到了好消息。)

Occasional

/əˈkeɪ.ʒən.əl/

偶爾的

He makes occasional trips to the beach during summer weekends. (他在夏季週末偶爾去海灘旅行。)

Occupational

/ˌɒk.jʊˈpeɪ.ʃən.əl/

職業的

Nurses face many occupational hazards, including exposure to infectious diseases. (護士面臨許多職業危害，包括接觸傳染病。)

Odd

/ɒd/

奇怪的；奇數的

It seemed odd that nobody answered the phone at midday. (沒有人在中午接電話似乎很奇怪。)

Offensive

/əˈfen.sɪv/

冒犯的；攻擊性的

His offensive remarks during the meeting upset several colleagues badly. (他在會議上的冒犯性言論嚴重地惹惱了幾位同事。)

Official

/əˈfɪʃ.əl/

官方的

We are still waiting for the official announcement of the election results. (我們仍在等待選舉結果的官方宣布。)

Officious

/əˈfɪʃ.əs/

多管閒事的

The officious clerk insisted on seeing multiple forms of identification. (多管閒事的職員堅持要看多種形式的身份證明。)

Ominous

/ˈɒm.ɪ.nəs/

不祥的

Dark ominous clouds gathered in the sky before the storm. (暴風雨前，天空中聚集著黑色的不祥烏雲。)

Omnipotent

/ɒmˈnɪp.ə.tənt/

全能的

Many religions describe their god as omnipotent and all-knowing. (許多宗教將他們的神描述為全能和全知的。)

Omnipresent

/ˌɒm.nɪˈprez.ənt/

無所不在的

Technology has become omnipresent in almost every aspect of life. (技術已經在生活的幾乎每個方面都無所不在。)

Omniscient

/ɒmˈnɪs.i.ənt/

無所不知的

The narrator in this novel seems to be omniscient about characters' thoughts. (這部小說中的敘述者似乎對角色的思想無所不知。)

Onerous

/ˈɒn.ər.əs/

繁重的

The onerous task of reorganizing the entire filing system took weeks. (重新整理整個歸檔系統的繁重任務花了數週時間。)

One-sided

/ˌwʌnˈsaɪ.dɪd/

片面的

The report was criticized for presenting a one-sided view of events. (該報告因為提供了片面的事件觀點而受到批評。)

Ongoing

/ˈɒn.ɡoʊ.ɪŋ/

持續的

Police have launched an ongoing investigation into the recent thefts. (警方已對最近的盜竊案展開持續調查。)

Online

/ˈɒn.laɪn/

網上的

Many students now prefer online courses over traditional classroom learning. (現在許多學生更喜歡網上課程而非傳統課堂學習。)

Only

/ˈoʊn.li/

唯一的

This is the only photograph we have from my grandmother's childhood. (這是我們唯一一張祖母童年時的照片。)

Open

/ˈoʊ.pən/

開放的

They have an open relationship based on trust and honesty. (他們有一種基於信任和誠實的開放關係。)

Open-minded

/ˌoʊ.pənˈmaɪn.dɪd/

思想開明的

It's important to remain open-minded when discussing controversial topics together. (討論有爭議的話題時，保持思想開明很重要。)

Operable

/ˈɒp.ər.ə.bəl/

可操作的

The machine is still operable despite its age and condition. (儘管年齡和狀況，這台機器仍然可以操作。)

Operational

/ˌɒp.əˈreɪ.ʃən.əl/

運作的

The new subway line will be operational by the end of month. (新的地鐵線路將在月底前投入運行。)

Opportune

/ˈɒp.ə.tjuːn/

適當的；及時的

Your phone call came at an opportune moment to discuss the issue. (你的電話在一個適當的時刻打來討論這個問題。)

Opposite

/ˈɒp.ə.zɪt/

相反的

Their political views are completely opposite on almost every issue. (他們在幾乎每個問題上的政治觀點都完全相反。)

Oppressive

/əˈpres.ɪv/

壓迫的

The oppressive heat made it difficult to concentrate on our work. (壓抑的炎熱使我們難以專注於工作。)

Optimal

/ˈɒp.tɪ.məl/

最佳的

The researchers are trying to find the optimal conditions for growth. (研究人員正在努力尋找最佳的生長條件。)

Optimistic

/ˌɒp.tɪˈmɪs.tɪk/

樂觀的

Despite the setbacks, she remains optimistic about future success possibilities. (儘管遭遇挫折，她對未來的成功可能性仍然保持樂觀。)

Optional

/ˈɒp.ʃən.əl/

可選的

Attendance at the afternoon workshop is completely optional for all employees. (參加下午的工作坊對所有員工來說完全是可選的。)

Opulent

/ˈɒp.jə.lənt/

豪華的

The billionaire's opulent mansion features marble floors and golden fixtures. (這位億萬富翁豪華的宅邸擁有大理石地板和金色裝置。)

Oral

/ˈɔː.rəl/

口頭的

The final examination consists of written and oral components equally. (期末考試包括筆試和口試兩個同等重要的部分。)

Orange

/ˈɒr.ɪndʒ/

橙色的

The orange sunset created a beautiful backdrop for our beach photos. (橙色的日落為我們的海灘照片創造了美麗的背景。)

Ordinary

/ˈɔː.dɪ.nər.i/

普通的

On most ordinary days, she prefers to read quietly at home. (在大多數普通的日子裡，她更喜歡在家安靜地閱讀。)

Organic

/ɔːrˈɡæn.ɪk/

有機的

Many consumers prefer organic vegetables grown without chemical pesticides today. (現在許多消費者更喜歡不使用化學農藥種植的有機蔬菜。)

Original

/əˈrɪdʒ.ə.nəl/

原創的

Her original ideas always stand out in creative team meetings. (她的原創想法總是在創意團隊會議中脫穎而出。)

O 開頭的英文單字

音標

中文意思

例句

Obediently

/əˈbiː.di.ənt.li/

服從地

The dog obediently followed its owner through the crowded market street. (狗狗服從地跟隨著主人穿過熱鬧的市場街道。)

Objectively

/əbˈdʒek.tɪv.li/

客觀地

You need to evaluate the situation objectively without emotional involvement now. (你現在需要不帶情緒地客觀評估這個情況。)

Obligingly

/əˈblaɪ.dʒɪŋ.li/

樂意地

She obligingly offered to drive us to the airport early tomorrow morning. (她樂意地提出明天一早開車送我們去機場。)

Obliquely

/əˈbliːk.li/

間接地

The politician answered obliquely, never directly addressing the main question asked. (這位政治家回答得含糊其辭，從未直接回應所問的主要問題。)

Obscurely

/əbˈskjʊə.li/

模糊地

The author writes somewhat obscurely about his childhood experiences in memoirs. (這位作家在回憶錄中對他的童年經歷寫得有些模糊。)

Observably

/əbˈzɜː.və.bli/

明顯地

Her health improved observably after she started the new treatment. (開始新療法後，她的健康狀況明顯改善了。)

Observantly

/əbˈzɜːrvəntli/

細心地

The detective observantly noticed the footprints leading away from scene. (偵探細心地注意到了通往現場外的腳印。)

Obsessively

/əbˈses.ɪv.li/

著迷地

He works obsessively on his collection of vintage automobiles daily. (他每天著迷地研究他的古董汽車收藏。)

Obsoletely

/ˌɒb.səˈliːt.li/

過時地

This product is obsoletely designed compared to newer versions on market. (與市場上的新版本相比，這款產品的設計已經過時。)

Obstinately

/ˈɒb.stɪ.nət.li/

固執地

She obstinately refused to admit she had made any mistakes. (她固執地拒絕承認自己犯了任何錯誤。)

Obviously

/ˈɒb.vi.əs.li/

明顯地

He was obviously disappointed when his name wasn't called winner. (當他的名字沒有被叫為獲勝者時，他明顯地感到失望。)

Occasionally

/əˈkeɪ.ʒən.əl.i/

偶爾地

She occasionally visits her hometown during major holiday seasons only. (她僅在主要假日期間偶爾回訪她的家鄉。)

Oddly

/ˈɒd.li/

奇怪地

The machine started behaving oddly just before it broke down. (這台機器在剛剛故障前開始表現得很奇怪。)

Offensively

/əˈfen.sɪv.li/

冒犯地

He spoke offensively to the customer service representative on phone. (他在電話中以冒犯的方式對客服代表說話。)

Officially

/əˈfɪʃ.əl.i/

正式地

The new bridge will be officially opened by the mayor next month. (新橋將於下個月由市長正式開通。)

Off-handedly

/ˌɒfˈhæn.dɪd.li/

隨意地

He mentioned off-handedly that he might change jobs soon. (他隨口提到他可能很快會換工作。)

Often

/ˈɒf.ən/

經常地

I often take long walks through the park near my apartment. (我經常在我公寓附近的公園裡長時間散步。)

Ominously

/ˈɒm.ɪ.nəs.li/

不祥地

The dark clouds gathered ominously over the mountain peaks before storm. (暴風雨前，烏雲不祥地聚集在山頂上。)

Omnisciently

/ɒmˈnɪs.i.ənt.li/

全知地

The narrator describes the characters' thoughts omnisciently throughout the novel. (敘述者在整部小說中全知地描述角色的思想。)

Onward

/ˈɒn.wərd/

向前地

From that point onward, she dedicated herself to helping others. (從那時起，她致力於幫助他人。)

Openly

/ˈəʊ.pən.li/

公開地

The couple openly discussed their relationship problems with counselor. (這對夫妻公開地與顧問討論他們的關係問題。)

Operatically

/ɒpˈræt.ɪk.li/

歌劇式地

She sang operatically, her voice filling the entire concert hall. (她以歌劇式的方式唱歌，她的聲音充滿了整個音樂廳。)

Opportunely

/ˈɒp.ə.tjuːn.li/

適時地

The funds arrived opportunely just before the final payment deadline. (資金適時地在最後付款期限前到達。)

Oppositely

/ˈɒp.ə.zɪt.li/

相反地

The twins often behave oppositely despite their identical appearance. (這對雙胞胎儘管外表一樣，行為卻常常相反。)

Oppressively

/əˈpres.ɪv.li/

壓抑地

The humidity felt oppressively heavy during the summer afternoon. (在夏日的下午，濕度感覺壓抑地沉重。)

Optimally

/ˈɒp.tɪ.məl.i/

最佳地

The resources have been optimally distributed to maximize productivity. (資源已被最佳地分配以最大化生產力。)

Optimistically

/ˌɒp.tɪˈmɪs.tɪk.li/

樂觀地

She looked optimistically towards the future despite current challenges. (儘管面臨當前的挑戰，她仍樂觀地展望未來。)

Optionally

/ˈɒp.ʃən.əl.i/

可選地

You can optionally add your phone number to the contact form. (你可以選擇性地在聯繫表格中添加你的電話號碼。)

Orally

/ˈɔː.rəl.i/

口頭地

The instructions were given orally rather than in written form. (指示是以口頭方式而非書面形式給出的。)

Ordinarily

/ˌɔː.dɪˈner.əl.i/

通常地

Ordinarily, the shop closes at six o'clock every weekday evening. (通常，這家商店每個工作日晚上六點關門。)

Organically

/ɔːˈɡæn.ɪk.li/

有機地

These vegetables are grown organically without any artificial fertilizers. (這些蔬菜是有機種植的，沒有使用任何人工肥料。)

Originally

/əˈrɪdʒ.ɪ.nəl.i/

本來地

The building was originally designed as a private residence. (這棟建築最初是設計為私人住宅的。)

Ornately

/ɔːˈneɪt.li/

華麗地

The ceiling was ornately decorated with gold leaf and carvings. (天花板用金箔和雕刻華麗地裝飾著。)

Ostensibly

/ɒˈsten.sə.bli/

表面上地

He was ostensibly working late, but actually meeting friends secretly. (他表面上在加班，但實際上在秘密會見朋友。)

Otherwise

/ˈʌð.ə.waɪz/

否則；以其他方式

The dress fit perfectly but was otherwise not what she wanted. (這件裙子很合身，但在其他方面不是她想要的。)

Outright

/ˈaʊt.raɪt/

完全地

She rejected his proposal outright without any consideration. (她完全拒絕了他的提議，沒有任何考慮。)

Outwardly

/ˈaʊt.wəd.li/

外表上地

He appeared outwardly calm, but was actually very nervous inside. (他外表上看起來很平靜，但實際上內心非常緊張。)

Overall

/ˌoʊ.vərˈɔːl/

全面地

Overall, the project was successful despite some minor setbacks. (總體而言，儘管有一些小挫折，這個項目是成功的。)

Overnight

/ˌoʊ.vərˈnaɪt/

一夜之間地

His reputation changed overnight after winning the major competition. (在贏得大型比賽後，他的聲譽一夜之間改變了。)

Overwhelmingly

/ˌoʊ.vərˈwel.mɪŋ.li/

壓倒性地

The proposal was overwhelmingly approved by the board of directors. (提案被董事會壓倒性地批准。)

Obviously

/ˈɒb.vi.əs.li/

明顯地

She was obviously uncomfortable during the awkward dinner conversation. (在尷尬的晚餐對話中，她明顯地感到不舒服。)

operation、obvious、overwhelming、objective、outstanding、oversee、optimize、obtain、optimistic、optional

練習1

練習2

1. optional

2. objective

3. optimistic

4. outstanding

5. obvious

6. oversee

7. operation

8. obtain

9. optimize

10. overwhelming

1. Observe (動詞) → observation (名詞) → observable (形容詞)

2. Origin (名詞) → originate (動詞) → original (形容詞)

3. Option (名詞) → optional (形容詞) → optionally (副詞)

4. Optimism (名詞) → optimistic (形容詞) → optimistically (副詞)

5. Obey (動詞) → obedient (形容詞) → obediently (副詞)