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| NOUN |
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| /ˌɒpəˈreɪʃn/ |
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| 1 | C a planned activity involving a lot of people , especially soldiers or police officers 活动；行动；（尤指）军事行动，警方行动 |
| This was the biggest military operation for 20 years. 这是20年来最大的军事行动。 |
| Undercover operations led to the arrest of the gang. 警方的卧底行动使这一团伙的成员悉数落网。 |
| rescue/relief/cleanup operation The cleanup operation will take weeks. 这次清扫行动要花几周时间。 |
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| 2 | C an action or set of actions that is necessary to achieve something 工序 |
| Connecting the water supply is a very simple operation. 连接供水系统是一道很简单的工序。 |
| The computer performs this operation many times every day. 计算机每天要多次执行这项操作。 |
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| 3 | C the process of cutting into someone’ s body for medical reasons 手术 |
| a knee/heart operation 膝部/心脏手术 |
| +on She may need an operation on her knee. 她可能需要接受膝部手术。 |
| have/undergo an operation The baby had to have an operation, but he’ s fine now. 这个婴儿不得不做了一次手术，不过他现在情况很好。 |
| do/perform/carry out an operation A very experienced heart surgeon will perform the operation. 将由一位非常有经验的心脏外科医生实施这一手术。 |
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| 4 | C a company or part of a large company 企业；分公司 |
| The company has recently expanded its UK operation. 该公司最近扩大了它在英国的分公司。 |
| The group is selling its overseas operations. 该集团正在出售它的海外分公司。 |
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| 5 | U the way that something such as a system or service operates （制度、服务等的）运作，实行 |
| We are visiting schools to explain the operation of the new exam system. 我们正深入到各个学校，对新的考试制度的运作进行解释。 |
| | 5a | used about the way a machine or piece of equipment operates （机器或设备的）运行，运转 | | Something was interfering with the radar equipment’ s operation. 有东西在干扰雷达设备的运行。 | |
| | 5b | used about the way something such as a rule or an idea is used （规则、主意等的）使用，运用 | | Science investigates the operation of general laws. 科学研究探索的是普遍法则的作用原理。 | |
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| 6 | U the process of controlling something or making it work 操作；作业；管理 |
| Operation of this equipment requires special training. 操作这一设备需要特殊的培训。 |
| PHRASES |
| - | in operation
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| 1 | working in the normal way 工作中；操作中；运转中 | How long has the business been in operation? 这家公司开办多久了？ | | Only one of our telephone lines is currently in operation. 眼下我们的电话线只有一条能通。 | |
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| 2 | existing and having an effect in a situation 在实施中；起作用；生效 | Guidelines governing the use of email are now in operation. 电子邮件使用的指导方针正在实施中。 | |
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| - | into operation
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| if something comes or goes into operation , it starts to work or become effective |
| 开始工作；开始运转；开始生效 |
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| The new production plant went into operation last month. 新的制造厂上个月投入运转。 |
| put/bring sth into operation New legislation will be brought into operation in January. 新法规将于1月份开始生效。 |
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