PHn.[化]酸碱度(=Potential Of Hydrogen)abbr.公共卫生(=Public Health)abbr.紫心勋章(=Purple Heart)Phen Bar苯巴比妥, 鲁米那, 卢米那尔, 迦地那[镇静催眠药]

1. Plenty of exercise is conducive to good health.
   多进行体育锻炼，对健康大有好处。
2. We can keep fit by going in for exercise.
   我们可以通过参加体育锻炼来保持健康。