exercise 作名词时视含义不同,可能可数也可能不可数。活动;运动activity/movements1. [u](身体或脑力的)活动,锻炼,运动physical or mental activity that you do to stay healthy or become stronger2.[c](保持健康或培养技能的)一套动作,训练活动,练习a set of movements or activities that you do to stay healthy or develop a skill