通常，当它们游泳时，会发出咔嚓的声音，所产生的声波会在回声中被反射回到它们身边。

Usually, as they swim, they make clicking noises, and the resulting sound waves are reflected in an echo and travel back to them.

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让我们来谈谈声谱的另一端，人类听不到的声音——超声波。

Let's talk about the other end of the acoustical spectrum, sound that is too high for humans to hear—ultrasound.

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它的工作原理是分析传入声音的声波并产生新一轮向外扩散的声波。

It functions by analyzing the waves of the incoming sound and creating a second set of outgoing waves.

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The lowest sounds create the largest sound waves and they last the longest.

最低的声音发出了最长声波,而且声波持续最久

耶鲁公开课 - 聆听音乐课程节选

Yes, to some extent it is that, yes, but what I was thinking about here is this idea that the lowest sounds create the longest sound waves, and they last the longest.

是的,从某种程度上来说是那样,但我在想的是这个理论,最低的声音,发出最长的声波,而且持续的最久

耶鲁公开课 - 聆听音乐课程节选

We're used to thinking about sound being tranduced; being converted by acoustic waves into electrical signals that can be recognized by your iPods.

我们想想声音信号的转换过程,声音由声波转化为电子信号,你的iPod能够识别这种信号

耶鲁公开课 - 生物医学工程探索课程节选