exercise读音：[ˈeksəsaɪz]
n.(身体或脑力的) 活动，锻炼，运动; (保持健康或培养技能的) 一套动作，训练活动; 习题; 练习;
v.行使; 使用; 运用; 锻炼; 训练; 操练; 锻炼(身体某部位);
例：
Swimming is good exercise.
游泳是有益的运动。
Exercise is a good safety valve for the tension that builds up at work.
锻炼身体是排解工作压力的好办法。
Exercise will not only lower blood pressure but possibly protect against heart attacks.
锻炼不仅会降低血压，而且可能对心脏病有预防效果。
He collapsed following a vigorous exercise session at his home.
在家剧烈运动了一阵后他突然昏倒了。
