A close mouth catches no flies. 
病从口入.
A good medicine tastes bitter. 
良药苦口.
An apple a day keeps the doctor away. 
一天一苹果,不用请医生.
An ounce of prevention is worth a pound of cure. 
预防为主,治疗为辅. 
A sound mind in a sound body. 
健全的精神寓于健康的身体. 
Early to bed and early to rise make a man healthy, wealthy and wise. 
早睡早起,令人健康、富有而且聪明
Eat at pleasure, drink with measure. 
随意吃饭,适度饮酒.
Exercise, temperance, fresh air, and needful rest are the best of all physicians. 
锻链、节制、新鲜空气和必要的休息是最好的医生.
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