The opportunity does not go hand in hand, so when they come, you’d better hold them.
机会并不会如影相随，所以当它到来的时候，你最好抓住。
The true test of civilization is not the census, nor the size of cities, nor the crops, but the kind of man that the country turns out.
模形式的算术是理解数论更深层次结构的关键。
The past is a place of reference, not a place of residence.