on the spur of the moment
used to say that a decision, action, etc. is
sudden and done without any planning
例句：
We just jumped in a car on the spur of the moment
and drove to the seaside.
我們一時心血來潮，
當即跳上汽車(chē)向海邊(biān)開去。
We hadn't planned to go away - it was
one of those spur-of-the-moment decisions.
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