教学主题：你读几年级？
你在大学读几年级？
请两位先做个自我介绍吧，诸如你们读几年级，从何而来，在普林斯顿学什么专业等。
And why don't we just start by you introducing yourselves a little bit about like what year you are, where you're from and what you're studying in Princeton.
可是有些人认为，读第几年级就做第几年级的作业以及书，读过的做过的都若无其事，这样一来，成绩也跟不上来，这种做法是不可靠的。
But some people think, how many grade do what grade homework and book, did you read all as if nothing happened, so the results don't come, it is not reliable.
可是有些人认为，读第几年级就做第几年级的作业以及书，读过的做过的都若无其事，这样一来，成绩也跟不上来，这种做法是不可靠的。
But some people think, how many grade do what grade homework and book, did you read all as if nothing happened, so the results don't come, it is not reliable.
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