1. The IRS considers you to be on business travel if the normal demands of your business take you away from your tax home for longer than one day's work.2. After her husband went on a business trip to Paris, she waited for his return anxiously.3. While I was on a business trip with my ex-wife, we rekindled the romance and decided to get married again.
 go on business travel go on a business trip to somewhere go to a business trip be on a business trip be on business travelgo on a business trip 跟 go on business travel 都是出差的正統的美語說法，business trip 就是跟工作有關的旅行。
My boyfriend keeps pushing me to marry him, and I keep putting him of because I am not sure if he's right for me.