goodexercise可數(shù)嗎

　　exercise不可數(shù)名詞的用法：

　�。ㄉ眢w或腦力的）活動(dòng)，鍛煉，運(yùn)動(dòng)：

　�。�1）Swimming is good exercise.

　　游泳是有益的運(yùn)動(dòng)。

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

　　我整天坐在辦公室很少運(yùn)動(dòng)。

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

　　大腦同身體一樣需要鍛煉。

　　行使；運(yùn)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