什么是

• what is ... ?

例句

1. 玛丽不知道什么是战争，她没有体验过战争的痛苦。
   Mary doesn't know what war is, doesn't know the meaning of the word.
2. 他们谈论什么是我们所想要知道的事。
   What they talked about is what we want to know.
3. 她认为自己懂得什么是生活。
   She esteemed that she knew what life was.