当选择自动增益方式时，增益的改变通过增益同步脉冲触发，触发脉冲可由系统内部周期产生或外部提供。
When the former was chosen, the change of gain would come true by the synchro pulse, which was supplied by the cycle inside the system or outside the system.
通过将生物体与外部的周期信号完全隔离，生物学家了解到生物体有内部的生物钟。
By isolating organisms completely from external periodic cues, biologists learned that organisms have internal clocks.
把组件增加到显示列表以进行测试——这一步启动了组件的内部生命周期，以便对其方法进行真正测试。
Add the component to the display list for testing - This step starts the internal life cycle of the components, which is needed for real testing of its methods.
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