what's

英 [wɒts]

美 [hwɑts]

是什么;什么是;什麽;what is 或 what has 的常用口语形式，尤当 has 为助动词时

Collins.4

柯林斯词典

(尤当 has 为助动词时，what is 或 what has 的常用口语形式)
What'sis the usual spoken form of 'what is' or 'what has', especially when 'has' is an auxiliary verb.

'What's with this guy?' demanded an American voice in the row in front.
“这人怎么了？”前排有个美国人问道。
Then he'll know exactly what's required of him.
到那时他就会确切地知道对他的要求是什么了。
What's the trouble with the machine?
这机器出了什么故障？
What's the matter with you?--Just a bit of a headache; nothing serious.
你怎么了？--没啥，有点头疼。
What's wrong with you is that you think you can get something for nothing.
你的问题是你认为自己可以不劳而获。
What's the matter?
吗事？
I think most of us don't want to read what's in the newspaper anyway in such detail
我想我们大多数人无论如何都不想如此仔细地去读报纸。
What's your view on this matter?
你对这件事怎么看？
I don't know what's going on.
我不知道发生了什么事。
What's the trouble with the car?
这辆汽车出了什么毛病？