fact of life

柯林斯词典

1. N-COUNT You say that something which is not pleasant is a fact of life when there is nothing you can do to change it so you must accept it. 现实; 无法改变的事实
Stress is a fact of life from time to time for all of us. 压力对我们所有人来说都是时常面对的现实。
2. N-PLURAL If you tell a child about the facts of life, you tell him or her about sexual intercourse and how babies are born. 性知识['the' N]
There comes a time when children need to know more than the basic facts of life. 儿童到了一定的时候就需要了解更多的性知识。