"被"最常用来表示被动，就是说一件事情不是自己做的，而是别人做的。

"被" is most commonly used to indicate the passive voice, meaning an action is done by someone else, not oneself.

它也可以当名词用，意思是盖在身上的东西，比如"被子"。

It can also be used as a noun, meaning something that covers the body, like a "被子" (quilt).