题目内容：

exercise与exercises区别,两者联系,要怎么用?

优质解答

它解释为运动时是不可数名词 If you don't get more exercise,you'll get fat.解释为习题时才可数 school work exercises [C]为可数~`即可以加S [U]为不可数~不加S n.1.运动,锻炼[C][U] Swimming is one of the heal...