I often reflect on my schooldays.

我经常回起我上学的日子。

Life often seems to be marked off into different periods: schooldays,marriage,old age.

生命似乎分为三时期：学生时代,结婚,老年。

His schooldays were a torment.

他的学生时期是一场苦难。

I wish I could put the clock back and relive my schooldays; I regret not having tried harder and passed more exams.

我希望时光能够倒退回去，我可以重新去过学生时代的生活。我后悔当初够努力，没有通过更多的考试。