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

There will in fact never be a good time to try something new, and there will actually never be a semester where you do have that more time.

实际上我已经没有机会尝试新事物了，而且也不用过学期了,但你们有更多的时间。

哈佛公开课 - 计算机科学课程节选