Suddenly, the distinctions that the simile works so hard to establish are beginning to erode.

突然，这种比喻竭力想要表现的区别,开始崩塌。

耶鲁公开课 - 弥尔顿课程节选

I'll play a melody without vibrato and with vibrato so you can see the difference.

我来演奏一段旋律,分有揉弦和没有揉弦两种表现,这样你们就能听出区别

耶鲁公开课 - 聆听音乐课程节选