他是干什么工作的？
或许他会很快发现他们在干什么，他们是谁，他们的兴趣、工作。
Or he rapidly finds out what they're doing, what their interests are, what their job is, who they are.
你爸爸是干什么的？他是科学家。科学家？他做什么？他做实验。他在实验室工作。
What's your father do? He is a scientist. Scientist? What's he do? He does experiment. He works in the lab.
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