标准事件对应用程序来说就是一些有意义的行为。

Standard events are meaningful activities that are of interest to applications.

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这种事件对应CPU内部和外部的硬件电路产生的电子信号。

Such events correspond to electrical signals generated by hardware circuits both inside and outside the CPU chip.

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当事件发生时，与这个事件对应的对象发出信号，通知主循环事件已经发生。

When an event occurs, the object associated with that event emits a signal to inform the main loop that it has occurred.

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These are called population measures because they refer to the whole population of possible outcomes and they measure the probabilities.

这些是用来度量总体的变量,因为他们对应的是总体中所有的结果,度量的是所有事件的概率

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