goodexercise可數(shù)嗎

　　exercise不可數(shù)名詞的用法：

　　（身體或腦力的）活動，鍛煉，運動：

　�。�1）Swimming is good exercise.

　　游泳是有益的運動。

　　（2）I don't get much exercise sitting in the office all day.

　　我整天坐在辦公室很少運動。

　�。�3）The mind needs exercise as well as the body.

　　大腦同身體一樣需要鍛煉。

　　行使；運用；使用：

　�。�1）the exercise of power by the government

　　政府權(quán)力的行使

　　（2）the exercise of discretion

　　自行決定權(quán)的行使