a person who is related to you and who lives after you, such as your child or grandchild

He has no descendants. 他没有后代。

They claim to be descendants of a French duke. 他们自称是一位法国公爵的后代。

We owe it to our descendants (= people younger than us who will live after we have died) to leave them a clean world to live in. 给子孙后代留下一个清洁的生活环境是我们的职责。