名词

1. 冲动;一时兴起的念头
An impulse is a sudden desire to do something.

2. 脉冲
An impulse is a short electrical signal that is sent along a wire or nerve or through the air, usually as one of a series.

3. 一时兴起的;随兴的
An impulse buy or impulse purchase is something that you decide to buy when you see it, although you had not planned to buy it.

4. 凭冲动;一时兴起
If you do something on impulse, you suddenly decide to do it, without planning it.

1. the act of applying force suddenly

e.g. the impulse knocked him over

Synonym: impulsionimpetus

2. an impelling force or strength

e.g. the car's momentum carried it off the road

Synonym: momentum

3. the electrical discharge that travels along a nerve fiber

e.g. they demonstrated the transmission of impulses from the cortex to the hypothalamus

Synonym: nerve impulsenervous impulseneural impulse

4. (electronics) a sharp transient wave in the normal electrical state (or a series of such transients)

e.g. the pulsations seemed to be coming from a star

Synonym: pulsationpulsingpulse

5. a sudden desire

e.g. he bought it on an impulse

Synonym: capricewhim

6. an instinctive motive

e.g. profound religious impulses

Synonym: urge