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TOEFL IELTS BNC: 5362 COCA: 4695

impulse noun WISH

C2 [ C + to infinitive ] a sudden strong wish to do something沖動,突然的強烈欲望

I had this sudden impulse to shout out "Nonsense!" in the middle of her speech.在她發言時我突然想大喊“一派胡言!”。
on (an) impulse

C2 because you suddenly want to, although you haven't planned to一時興起,心血來潮

"I didn't know you were looking for some new shoes." "Oh, I wasn't - I just bought them on impulse."“我不知道你想要買雙新鞋。”“噢,不是的——我只是一時沖動才買的。”

impulse noun SIGNAL

[ C ] a short electrical, radio, or light signal that carries information or instructions between the parts of a system脈沖

an electrical/nerve impulse電脈沖/神經沖動

impulse noun REASON

[ C usually singular ] formal something that is the driving force behind or reason for something else動機;動力;刺激

a creative/commercial impulse創作沖動/商業動機

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