1. （由大量人员参与、具有高度组织性的）活动，行动，工作
    An operation is a highly organized activity that involves many people doing different things.

    e.g. The rescue operation began on Friday afternoon...
           救援行动于星期五下午开始。
    e.g. The soldiers were engaged in a military operation close to the Ugandan border.
           这些士兵参加了乌干达边境附近的一次军事行动。

2. 企业；公司
    A business or company can be referred to as an operation .

    e.g. Thorn's electronics operation employs around 5,000 people...
           索恩的电子公司雇用了约5,000名员工。
    e.g. The two parent groups now run their business as a single combined operation.
           这两个母公司现在合并为一家企业经营业务。

3. 手术
    When a patient has an operation, a surgeon cuts open their body in order to remove, replace, or repair a diseased or damaged part.

operation

    e.g. Charles was at the clinic recovering from an operation on his arm.
           查尔斯的胳膊动了手术，正在这家诊所进行康复治疗。

4. 使用；运作
    If a system is in operation, it is being used.

    e.g. Until the rail links are in operation, passengers can only travel through the tunnel by coach.
           在铁路连线开通之前，乘客只能乘坐长途客车穿越隧道。
    e.g. ...the free banking system that has been in operation since the early eighties.
           从80年代初就开始实行的自由银行制度

5. （机器、设备等的）运转，运行
    If a machine or device is in operation, it is working.

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    e.g. There are three ski lifts in operation.
           有3台滑雪缆车在运行。

6. （使）施行；（使）实行；（使）生效
    When a rule, system, or plan comes into operation or you put it into operation, you begin to use it.

    e.g. The Financial Services Act came into operation four years ago...
           《金融服务法》于4年前开始实施。
    e.g. Cheaper energy conservation techniques have been put into operation in the developed world.
           更经济的节能技术在发达国家已经投入使用。