日常英語 feel a sudden urge to do something 心血來潮
“心血來潮”，漢語成語，形容一時沖動，忽然起了某個念頭?？梢苑g為"be prompted by a sudden impulse; be seized by a whim"。常用表達如“心血來潮想做某事（feel a sudden urge to do something）”。
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例句：
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心血來潮改變原計劃，那怎么行呢?
How can we change our original plan on a sudden impulse?
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他突然心血來潮，想站起來唱歌。
He had a sudden impulse to stand up and sing.
