facts of life

名词 facts of life:

1. the sexual activity of conceiving and bearing offspring
   同义词：reproduction, procreation, breeding

1. It is a fact of life and you must face it.
   这是严酷的现实，你必须面对它。
2. We must all die some time: that's just a fact of life.
   我们终有一死，这就是生活的现实。