n.

1. 冲动，一时的念头[C][U]
   My uncle bought the house on an impulse.

   我叔叔一时冲动买下了那房子。

   I used to act out of blind impulse when I was young.

   我年轻时常凭盲目的冲动行事。

2. 推动力；刺激[C]
   The signing of the agreements will give an impulse to trade between the two countries.

   这些协议的签订会促进两国间的贸易。

3. 【生理】神经冲动；【电】脉冲[C]

n.

1. a sudden strong and unreflective urge to act.
2. an impetus.
3. a pulse of electrical energy; a brief current.
4. Physics  a force acting briefly on a body and producing a change of momentum.