To produce snow requires both heat and cold; the first to evaporate, the second to condense John Lubbock.
雪的形成需要热和冷两个条件；前者起蒸发作用，后者起凝结作用(约翰·卢布克)。
With this extra evidence John Snow was able to announce with certainty that polluted water carried the disease.
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。
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.
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。
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