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 up?', I said to him. — 'Nothing much,' he answered
“出什么事啦？”我对他说。——“没什么事，”他答道。
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 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。
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 your speciality?
你的专长是什么？
What's wrong?; What's happening?
出了什么事？
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 the time?; What time is it?
几点钟了？
What's wrong with him?
他怎么了？
Carole, what's the matter? You don't seem happy
卡萝尔，出什么事了？你好像不开心。