spur of the moment片语

一时冲动、临时起意、一时兴起常用于 on the spur of the moment

We booked the trip on the spur of the moment, with no plan at all.

我们一时兴起就订了这趟旅行，完全没有计划。

临时的、一时冲动的、即兴的

It was a spur-of-the-moment decision that she later regretted.

那是个一时冲动的决定，她后来很后悔。