im·pul·sion
noun/ɪmˈpʌlʃn/
/ɪmˈpʌlʃn/
(formal)- [countable] a strong desire to do something
强烈的欲望；冲动 - [uncountable] a reason for doing something
动机；原因；目的 - Lack of food and water provided much of the impulsion for their speed.
缺少食物和水促使他们加快了速度。
- Lack of food and water provided much of the impulsion for their speed.
Word Originlate Middle English (in the sense ‘the action or an instance of impelling’): via Old French from Latin impulsio(n-), from the verb impellere, from in- ‘towards’ + pellere ‘to drive’.