on a business trip
我们出公差所用的每一分钱都得报清楚。
We have to account for every penny we spend on business trips.
《牛津词典》
你上司不在办公室，说明他在出公差。
When your boss is out of the office, he's on business.
youdao
明天我要去外国出公差。
I am to go abroad on business tomorrow.
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