有了这个证据，约翰·斯诺就能够肯定的宣布，这种被污染的水携带病毒。
With this extra evidence John Snow was able to announce with certainty that polluted water carried the disease.
开出麻醉剂药方的医生约翰·斯诺是传染病学的开创者之一，他曾追踪一场大规模暴发的致命霍乱的病源，最后在伦敦苏荷区的一个抽水机里找到了。
John Snow, the doctor who administered the drug, is better known as one of the founding fathers of epidemiology, after he traced a deadly outbreak of cholera to a Soho water pump.
为防止这种情况再度发生，约翰·斯诺建议，所有水源都要经过检测，而且要寻找处理污水的新方法。
To prevent this from happening again, John Snow suggested that the source of all water supplies be examined and new methods of dealing with polluted water be found.
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