题目内容：

Exercise分别作什么意思时可用复数?
即exercise的用法

优质解答

exercise 动词“锻炼”,如 He exercises every day.此时,exercises 是 exercise 的单三形式.
名词.
（1）“练习”,“操练”可数名词 如 There are many exercises in the book.
We should do eye exercises.
（2）“锻炼”,不可数名词 如 Let's take exercise.