be away on official business;be travel on official business;be on a business trip;

Staff who have to travel farther can claim excess travel expenses.
需要到更远的地方出差的职员可以领取额外差旅费。
来源:《柯林斯高阶英汉双解学习词典》Mark, however, needs to travel extensively with his varied business interests.
然而,马克因为各种生意需要频繁出差。
来源:《柯林斯高阶英汉双解学习词典》When the Peru business had first presented itself, it had not seemed an extraordinary opportunity.
秘鲁的这趟出差起初也不起眼, 不像是个什么了不起的机遇.
来源:名作英译部分
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