exercise可数名词的用法
1.（保持健康或培养技能的）一套动作，训练活动，练习
（1）breathing/relaxation/stretching exercises
呼吸 / 放松 / 伸展运动
（2）exercises for the piano
钢琴练习
（3）Repeat the exercise ten times on each leg.
每条腿重复做十次这种动作。
2.习题；练习
（1）grammar exercises
语法练习
（2）Do exercise one for homework.
家庭作业做习题一。
3.（为达到特定结果的）活动
（1）an exercise in public relations
公共关系活动
（2）Staying calm was an exercise in self-control.
保持镇定是一种自我控制活动。
（3）a communications exercise
通信演习
（4）In the end it proved a pointless exercise.
这最终证明是一项毫无意义的活动。
4.（士兵的）操练，演习，演练
military exercises
军事演习
exercise不可数名词的用法
1.（身体或脑力的）活动，锻炼，运动
（1）Swimming is good exercise.
游泳是有益的运动。
（2）I don't get much exercise sitting in the office all day.
我整天坐在办公室很少运动。
（3）The mind needs exercise as well as the body.
大脑同身体一样需要锻炼。
2.行使；运用；使用
（1）the exercise of power by the government
政府权力的行使
（2）the exercise of discretion
自行决定权的行使