operation
noun uk/ˌɒp.ərˈeɪ.ʃən/ us/ˌɑː.pəˈreɪ.ʃən/
(WORK)
C1 [ U ]运作，实施，工作
the fact of operating or being active
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 ]（机器或系统的）运作，运行，运转；（对机器或系统的）操作，使用
the way that parts of a machine or system work together, or the process of making parts of a machine or system work together
C1 [ C ]企业
a business organization
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 ]（有目的的）活动，行动
an activity that is planned to achieve something
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.
(MEDICAL PROCESS)
B1 [ C ] (UK informal op)手术
an occasion when a doctor cuts a body for medical reasons in order to repair, remove, or replace an unhealthy or damaged part
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.
(MATHEMATICS)
[ C ] mathematics specialized（数学）运算
a mathematical process, such as addition, in which one set of numbers is produced from another