要测试信号，请按住键盘上的空格键15秒。
To test the signal, hold down the SPACEBAR on your keyboard for 15 seconds.
若要选取多个中断点，请按住ctrl键并按一下其他中断点。
To select multiple breakpoints, hold down the CTRL key and click additional breakpoints.
若要展开选取数个步骤，请按住 SHIFT 不放，直到按一下最后一个步骤。
To extend the selection over several steps, hold down SHIFT until you click the last step.
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