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在1854年伦敦再次暴发霍乱的时候，约翰·斯诺着手准备对此进行调研。As the disease spread quickly through poor neighbourhoods, he began to gather information.当霍乱在贫民区迅速蔓延的时候，约翰·斯诺就开始收集资料。In two ----
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particular streets, the cholera outbreak was so severe that more than 500 people died in ten days.他发现特别在两条街道上霍乱流行的很严重，在10天之内就死去了500多人。He was determined to find out why.他决心要查明其原因。
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First he marked on a map the exact places where all the dead people had lived.首先，他在一张地图上标明了所有死者住过的地方。This gave him a valuable clue about the cause of the disease.这提供了一条说明霍乱起因的很有价值的线
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索。Many of the deaths were near the water pump in Broad Street (especially numbers 16, 37, 38 and 40).许多死者是住在宽街的水泵附近（特别是这条街上16、37、38、40号）。He also noticed that some houses (such as 20 and 21 Broad Street
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