The Doppler effect explains changes in the length of light waves or sound waves as they move toward you or away from you.

VOA: special.2009.04.29

But because the way sound waves operate, we have these low sound waves taking a very long time to clear.

但鉴于声波的传播方式,低声波要过更长的时间才消失

耶鲁公开课 - 聆听音乐课程节选

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

But extra wax can harden and form a blockage that interferes with sound waves and reduces hearing.

VOA: special.2010.03.31

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

Then the snow's surface will help to send back sound waves.

VOA: special.2010.01.05

They're short sound waves.

而那些短的声波

耶鲁公开课 - 聆听音乐课程节选

Snow also is known to influence the movement of sound waves.

VOA: special.2010.01.05

The wind came again. Finally,the men heard a new sound C the sound of waves breaking and crashing on the shore.

VOA: special.2010.03.06