My father is on a business trip.

来源：business trip 在商务场合中常用的说法，指的是出差。

英文例句：

My father will be gone for a week on a business trip.
我父亲将会出差一周。
He has to attend an important meeting during his business trip.
他在出差期间必须参加一个重要会议。
She traveled abroad for a business trip.
她出国出差了。

中文翻译：

我父亲将会出差一周。
他在出差期间必须参加一个重要会议。
她出国出差了。