exercise 与exercises 的区别及用法
问题描述：
exercise 与exercises 的区别及用法
答
exercise 可以是动词“锻炼”,如 He exercises every day.此时,exercises 是 exercise 的单三形式.exercise也可以是名词.（1）“练习”,“操”可数名词如 There are many exercises in the book. ...早操：morning exercises