be on a business trip
我正在出差 I was on business ; I am on mission
我爸爸正在出差 My father was on business
抱歉，他现正在出差。请问是谁找他？
Sorry, he is being abroad on business. May I ask who is calling?
youdao
这位工程师正在出差，也就是说，他不在这里。
The engineer is on a business trip, in other words, he is not here.
Let's pretend that you are spending the night on a business trip in a hotel
假设你正在出差，在酒店度过一晚。
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