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BNC: 619 COCA: 826
operationnounuk/ˌɒp.ərˈeɪ.ʃən/ us/ˌɑː.pəˈreɪ.ʃən/

operation noun WORK

C1 [ U ] the fact of operating or being active运作，实施，工作

There are several reactors of the type in operation (= working) at the moment.目前有几个这样的反应堆在工作。
We expect the new system for assessing claims to come into operation (= start working) early next year.我们预计明年初施行核定索赔的新方案。

[ U ] the way that parts of a machine or system work together, or the process of making parts of a machine or system work together（机器或系统的）运作，运行，运转；（对机器或系统的）操作，使用

C1 [ C ] a business organization企业

Less profitable business operations will have difficulty in finding financial support.盈利较少的企业将很难得到财政资助。

C1 [ C ] an activity that is planned to achieve something（有目的的）活动，行动

a military/peacekeeping operation.军事／维和行动
Following the earthquake, a large-scale rescue operation was launched.地震后发起了一场大规模的救援行动。
[ + to infinitive ] The operation to fly in supplies will begin as soon as possible.向这里空运补给品的行动会尽快展开。

More examples

The rescue operation has been complicated by bad weather.

We need to look at the logistics of the whole aid operation.

They mounted a salvage operation after the fire.

Starting your own business can be a risky operation.

They're winding down their operations abroad because they're losing money.

operation noun MEDICAL PROCESS

B1 [ C ] UK informal op an occasion when a doctor cuts a body for medical reasons in order to repair, remove, or replace an unhealthy or damaged part手术

a major/minor/routine operation大／小／常规手术
an abdominal/cataract/transplant operation腹部／白内障／移植手术
He has to have an operation on his shoulder.他的肩部必须做个手术。
[ + to infinitive ] We will know in a couple of days if the operation to restore her sight was successful.几天后我们就能知道她恢复视力的手术是否成功。

More examples

The hospital has a two-year waiting list for minor operations.

The child's parents or guardians must give their consent before she has the operation.

After the operation the wound became infected.

The operation involves putting a small tube into your heart.

The operation must be carried out under sterile conditions.

operation noun MATHEMATICS

[ C ] specialized mathematics a mathematical process, such as addition, in which one set of numbers is produced from another（数学）运算

BNC: 619 COCA: 826
operation

noun¹

 1medical醫療ADJECTIVE | VERB + OPERATION | PREPOSITION ADJECTIVE➤major大手術▸➤minor, small小手術▸➤life-saving, vital救生手術；性命攸關的手術▸➤emergency急診手術▸➤routine (especially BrE) 例行手術▸➤delicate精細的手術◇a delicate eye operation精細的眼科手術➤exploratory探查性手術▸➤surgical, transplant外科／移植手術▸➤heart, knee, etc.心臟、膝部等手術VERB + OPERATION➤have, undergo接受手術◇He had an operation to remove a growth.他做了贅生物切除手術。➤come through, survive安然度過手術◇She came through the operation well.她順利地經受了手術。➤carry out, perform動手術◇the surgeon performing the operation動手術的外科醫生PREPOSITION➤during a/the operation在手術中◇She woke during the operation.她在手術過程中醒過來了。➤operation for為⋯進行的手術◇an operation for a kidney problem腎病手術➤operation on對⋯進行的手術◇a major operation on his heart對他的心臟進行的一次大手術
operation

noun²

 2organized activity有組織的行動ADJECTIVE | VERB + OPERATION | PREPOSITION | PHRASES ADJECTIVE➤big, large-scale, major, massive大規模行動；重要行動▸➤covert, undercover秘密行動▸➤combined, joint聯合作戰▸➤tricky (especially BrE) 棘手的行動◇a tricky rescue operation棘手的營救行動➤successful成功的行動▸➤combat, intelligence, military, naval, police作戰／情報／軍事／海軍／警方行動▸➤air, flight, ground, land, sea空中／飛行／地面／陸地／海上行動◇US forces had to conduct ground and air operations.美軍不得不組織一系列地面和空中行動。◇The airline has appointed a new director of flight operations.這家航空公司新任命了一位航班業務主任。➤guerrilla游擊隊行動▸➤clean-up, counterterrorist, drilling, mining, mopping-up, offensive, peacekeeping, relief, rescue, salvage, security, tactical清理／反恐／演習／佈雷／清剿／進攻／維和／救助／營救／救援／安全／戰術行動◇UN troops supervised the relief operations.聯合國部隊監督了這次救助行動。➤banking, building, business, commercial銀行業務；建築施工；商業活動◇restrictions placed on business operations對商業活動的限制➤psychological operations, special operations心理活動；特別行動◇Special operations forces were on the ground in Afghanistan.特別行動部隊已經登陸阿富汗。VERB + OPERATION➤begin, launch, mount, undertake開始行動；發起行動◇The authorities launched a massive security operation in the city.當局在城內展開大規模的安全行動。➤carry out, conduct, run實施行動▸➤oversee, supervise監督行動PREPOSITION➤during a/the operation在行動中◇during joint military operations在聯合軍事行動中PHRASES➤a theatre/theater of operations (= where military operations take place) 戰區
operation

noun³

 3fact of sth functioning運作ADJECTIVE | VERB + OPERATION | PREPOSITION | PHRASES ADJECTIVE➤effective, efficient, smooth有效／高效／順利運轉▸➤normal正常運轉▸➤daily, day-to-day日常運轉◇the smooth day-to-day operation of the department該部門平穩的日常運轉VERB + OPERATION➤come into開始生效◇A ceasefire came into operation in May.停火於 5 月生效。➤bring sth into, put sth into使⋯生效▸➤cease停止運轉◇The factory will cease operation at the end of the year.這家工廠年底停工。PREPOSITION➤during operation運轉中◇The machine can get very hot during operation.這台機器運轉時會變得很熱。➤in operation在運轉中◇The current tax system has been in operation for ten years.現行稅制已運行 10 年了。PHRASES➤in full operation, into full operation處於／進入全面運轉◇the only reactor in full operation唯一全面運轉的反應堆
BNC: 619 COCA: 826
operation noun
⇨ company (a multinational operation) ⇨ project (a rescue operation) ⇨ trade (the firm's banking operations) ⇨ treatment (a medical operation) ⇨ in operation ⇨ active adj.
BNC: 619 COCA: 826
operation
A military or armed attack: air raid, air strike, attack...
Crime detection and prevention: agent provocateur, all-points bulletin, APB...
General words for actions and activities: action, measure, doings...
A series of actions or activities: series, process, campaign...
Medical operations: abortion, angioplasty, appendectomy...
General types of business or company: account, acquisition, affiliate...
Systems and methods for doing things: modality, method, system...
To work, or to start working (of a piece of machinery): operate, come on, function...
Use of something: user, use, application...

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