exercise在表示广播操、眼保健操等一节节的操时可数，练习题可数，表练习（抽象上的）不可数exercise:

n. 练习,作业,运动eg:1.Do the vocabulary exercise at the end of the chapter. 做这一章末尾的词汇练习。 2.Graduation exercises are usually held in June. 毕业典礼通常在六月举行。 v. 练习,运动,运用 exercise 名词的意思是. 练习,作业,运动

eg：1。The doctor advised him to take more exercise.

医生建议他多运动.

2。What others think exercises a great influence on most of us.

别人怎样想对我们多半会产生很大影响。