Activity is a unit of instruction execution, and is the building block of a process.

活动(activity)是指令执行的一个单元，它是一个流程的基本组成部分。

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Otherwise, an exception can occur before the execution of the block is completed.

否则，在完成块的执行之前，可能发生异常。

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Otherwise, an exception can occur before the execution of the block is completed.

否则，在完成块的执行之前，可能发生异常。

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