| 单词 | impulse |
| 释义 | impulse /im"puls/, n. 1. the influence of a particular feeling, mental state, etc.: to act under a generous impulse; to strike out at someone from an angry impulse. 2. sudden, involuntary inclination prompting to action: to be swayed by impulse. 3. an instance of this. 4. a psychic drive or instinctual urge. 5. an impelling action or force, driving onward or inducing motion. 6. the effect of an impelling force; motion induced; impetus given. 7. Physiol. a progressive wave of excitation over a nerve or muscle fiber, having either a stimulating or inhibitory effect. 8. Mech. the product of the average force acting upon a body and the time during which it acts, equivalent to the change in the momentum of the body produced by such a force. 9. Elect. a single, usually sudden, flow of current in one direction. adj. 10. marked by or acting on impulse: an impulse buyer. 11. bought or acquired on impulse: To reduce expenses, shun impulse items when shopping. [1640-50; < L impulsus pressure, impulse, equiv. to im- IM-1 + pul- (var. s. of pellere to push) + -sus, var. of -tus suffix of v. action] |
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