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TOEFL IELTS BNC: 5362 COCA: 4695
impulsenounuk/ˈɪm.pʌls/ us/ˈɪm.pʌls/

impulse noun WISH

C2 [ C + to infinitive ] a sudden strong wish to do something冲动，突然的强烈欲望

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

C2 because you suddenly want to, although you haven't planned to一时兴起，心血来潮

"I didn't know you were looking for some new shoes." "Oh, I wasn't - I just bought them on impulse."“我不知道你想要买双新鞋。”“噢，不是的——我只是一时冲动才买的。”

impulse noun SIGNAL

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

an electrical/nerve impulse电脉冲／神经冲动

impulse noun REASON

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

a creative/commercial impulse创作冲动／商业动机

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