I don't believe it! What are you doing here?

我简直无法相信！你在这里干什么？

《牛津词典》

"Dr. Campbell," he said, clearly surprised. "What are you doing here?"

“坎贝尔医生，”他一脸惊讶地说道，“你怎么会在这儿？”

《柯林斯英汉双解大词典》

youdao

"One correspondent not from America and then I will--(REPORTERS YELLING)--You know, we are not doing bidding here.Come on,".

VOA: standard.2009.04.03

What are you doing here today?

你今天来这做什么？

一起长大的朋友 - SpeakingMax英语口语达人

And because, of course, we have this carbon here what you end up doing is adding a carbon to your molecule.

因为，当然，我们这里有一个碳,接下来需要做的就是在你的分子中再加上一个碳。

麻省理工公开课 - 化学原理课程节选

When I would be there late at night, she might come in and say, 'What are you doing here?

CNN: Sandra Day O'Connor: Self-reliant and ambitious

What are you doing here right now?

NPR: Starting from Scratch in Waveland, Miss.

They have the iPhone, which is on the market today... is there a risk that the work you're doing here will look like they got there first?

ENGADGET: Live from D: Gates and Ballmer debut Windows 7