impulse

名词 impulse:

1. an instinctive motive
   同义词：urge
2. a sudden desire
   同义词：caprice, whim
3. the electrical discharge that travels along a nerve fiber
   同义词：nerve impulse
4. (electronics) a sharp transient wave in the normal electrical state (or a series of such transients)
   同义词：pulsation, pulsing, pulse
5. the act of applying force suddenly
   同义词：impulsion, impetus
6. an impelling force or strength
   同义词：momentum

1. We were seized by a sudden impulse to run.
   我们身不由己突然想跑。
2. An emotion, desire, physiological need, or similar impulse that acts as an incitement to action.
   动机一种能作为诱导物而激发行为的情绪、愿望、心理需要或者类似的心理推动力
3. On impulse, I picked up the phone and rang my sister in Australia.
   我一时心血来潮，拿起话筒就给在澳大利亚的妹妹打了个电话。
4. He bought the house on an impulse.
   他凭一时冲动买下了这所房子。

im.pulse

n.（名词）

An impelling force; an impetus.
动力：驱使性的力量；动力
The motion produced by such a force.
推动：由这种力量造成的移动
A sudden wish or urge that prompts an unpremeditated act or feeling; abrupt inclination:
冲动：突然的心愿或欲望导致的未经考虑的行动和感受；突兀的倾向：
例句：
had an impulse to run away; an impulse of regret that made me hesitate; bought a hat on impulse.
有一种跑开的冲动；突发的后悔之情令我犹豫不决；心血来潮买了一顶帽子

A motivating force or tendency:
本能：驱动力或倾向：
例句：
.Respect for the liberty of others is not a natural impulse in most men.(Bertrand Russell)
.对大多数人来说，尊重他人的自由并不是一种自然的本能.(伯特兰·罗素)

Electronics A surge of electrical power in one direction.
【电子学】 脉冲：电力的单向涌动
Physics The product obtained by multiplying the average value of a force by the time during which it acts. The impulse equals the change in momentum produced by the force in this time interval.
【物理学】 冲量，推进力：力的平均值与它的作用时间相乘的结果。等于力在其作用时间段内产生的动量的变化
Physiology The electrochemical transmission of a signal along a nerve fiber that produces an excitatory or inhibitory response at a target tissue, such as a muscle or another nerve.
【生理学】 神经脉冲：信号沿着神经纤维的电化性的传播，在目标组织上产生兴奋的或抑制的反应，如在肌肉或另一神经上
adj.（形容词）
Characterized by impulsiveness or acting on impulse:
冲动的：以冲动或即兴行动为特征的：
例句：
an impulse shopper; impulse buying.
即兴的购物者；即兴购物

来源：
Latin impulsus [from past participle of] impellere [to impel] * see impel
拉丁语 impulsus [] 源自impellere的过去分词 [驱使，迫使] *参见 impel