• 1. execution interval: 执行间隔

• 1.But, because the thread at priority 4 executes first, it should have a slightly larger share of the five-second execution interval and print out a higher loop count.
  但是由于首先执行优先级为4的线程，因此在五秒钟的执行时间间隔中，它分得的时间稍多一些并且打印的循环计数也稍大一些。
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• 2.The user is able to control both the polling interval and the duration of the execution.
  用户可以控制轮询时间间隔和执行持续时间。
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• 3.Note that while mouse click handler is executing the first interval callback executes. As with the timer its handler is queued for later execution.
  注意当鼠标点击事件正在执行的时候第一次的interval事件也触发了，与timer一样，它的事件也进入队列等待之后执行。
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