You've been listening to your parents' records and CDs and so maybe-- I'm delighted that you know this, but maybe this is too far below your dignity here so-- but good for you.

你已经听过很多父母的老唱片了,我高兴你明白这点,但是也许这些对于你来说太浅显了,但是还是对你有好处的

耶鲁公开课 - 聆听音乐课程节选

A very simple pattern that you undoubtedly have heard and used many times before.

这是一个非常简单的句型，毫无疑问，你肯定已经听过或使用过很多回了。

Where 课堂 - SpeakingMax英语口语达人

You've undoubtedly heard it many times before.

相信你之前已经听过很多次了。

When 课堂 - SpeakingMax英语口语达人

and undoubtedly you have heard and used "who" questions many times before.

毫无疑问，你肯定已经听过并且使用过“who”问句很多回了。

Who 课堂 - SpeakingMax英语口语达人