在六年级，你心目中的好朋友是那个走到你喜欢的尼克或苏姗那里请他们与你跳舞，这样如果他们不同意你就不用感到难堪的人。

In sixth grade your idea of a friend was the person who went up to Nicky or Susan, your new crush, and asked them to dance with you, so that if they said no you wouldn't have to be embarrassed.

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If you don't know that somebody should've taught you that in the 6th Grade or the 4th Grade or the 1st Grade or somewhere.

如果你不知道,那你们肯定是忘了,在六年级或四年级的时候老师肯定讲过,或者一年级,无所谓具体什么时候

耶鲁公开课 - 美国内战与重建课程节选