使用声卡录制并播放声音的实用程序。

Utility to record and play sounds by using a sound card.

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播放声音播放的短促声波的时间，以毫秒表示。

Play chirp the time of played chirp in ms.

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然后，研究人员播放声音但不进行电击，试着让小鼠忘记恐惧。

Then the researchers tried get the mice to forget those fears by playing the sound but not delivering a shock.

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And now, if I'm touching mouse pointer, we saw that Boolean expression before, play sound meow, wait a couple of seconds, and then just keep checking.

现在，如果我们碰下鼠标指针，起初我们看到一个布尔表达式，播放猫叫的声音，等几秒钟，然后如刚才那样做检测。

哈佛公开课 - 计算机科学课程节选