impulse

/ˌɪmˈpəls/

an instinctive motive

中文释义：冲动；脉冲；推动力

He bought the expensive watch on impulse without thinking twice.

他一时冲动买下了那块昂贵的手表，没有多加考虑。

The first impulse of many people is to check their phones upon waking.

许多人的第一冲动是醒来时查看手机。