我曾那么幼稚的以为，那就是我的永远。

I was so naive to think that it was my forever.

youdao

我曾那么幼稚的以为，那就是我的永远。

I was so naive to think that it is my forever.

youdao

我曾那么深刻的爱过你但那也只是爱“过”而已。

I was so deep love you but that is only love "of" just.

youdao

Now think of another product in American history that doubled every decade for four decades, and then imagine that that product became the country's, without question, absolute largest export.

思考下在美国历史中有没有另一种产品曾,有如此辉煌的成就,那么这个产品将毫无疑问地,成为美国最大的出口产品

耶鲁公开课 - 美国内战与重建课程节选