feel a sudden urge to do something 心血来潮

“心血来潮”，汉语成语，形容一时冲动，忽然起了某个念头。可以翻译为"be prompted by a sudden impulse; be seized by a whim¹"。常用表达如“心血来潮想做某事（feel a sudden urge to do something）”。

 

例句：

 

心血来潮改变原计划，那怎么行呢?

How can we change our original plan on a sudden impulse?

 

他突然心血来潮，想站起来唱歌。

He had a sudden impulse to stand up and sing.

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