名詞 facts of life:

1. the sexual activity of conceiving and bearing offspring
   同義詞：reproduction, procreation, breeding

1. It is a fact of life and you must face it.
   這是嚴(yán)酷的現(xiàn)實(shí)，你必須面對(duì)它。
2. We must all die some time: that's just a fact of life.
   我們終有一死，這就是生活的現(xiàn)實(shí)。