impulsion
n. 冲动；冲击；原动力
例句
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。
《牛津词典》
Impulsion is like a demon, it will result in terrible thing.
冲动是魔鬼，它会导致可怕的事情。
They ensure the proper impulsion and determine the dog's characteristic gait.
他们确保适当的冲动，并确定狗的步态特征。
