虽然我们不从这个角度思考，但你完全有理由认为，对很多疾病来说，运动和药物一样有效。
Although we don't think of it this way, you can make a pretty good argument that exercise is as good as drugs for many conditions.
但事实上，病人们对很多疾病有着深入的了解，尤其是慢性病如糖尿病和心脏病。虽然患有这些慢性病，病人通常能够活上很长的一段时间。
But patients actually know a great deal about many diseases, especially chronic ones like diabetes and heart problems with which they often live for many years.
霍乱已有几十年没在海地发生过了，因此很多居民对这一疾病并不了解。
The disease had not been seen in Haiti for decades, and many people don't know about it.
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