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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

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