| 单词 | impulse |
| 释义 | impulse n. 1. the act or an instance of impelling; a push. 2. an impetus. 3. Physics a an indefinitely large force acting for a very short time but producing a finite change of momentum (e.g. the blow of a hammer). b the change of momentum produced by this or any force. 4. a wave of excitation in a nerve. 5. mental incitement. 6. a sudden desire or tendency to act without reflection (did it on impulse). Phrases and idioms impulse buying the unpremeditated buying of goods as a result of a whim or impulse. Etymology: L impulsus (as IMPEL) |
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