particular streets, the cholera outbreak was so severe\s\up1(26(26) that\s\up1(27(27) more than 500 people died in ten days. He was determined to find out\s\up1(28(28) why.

　　\s\up1(21(21)suspect [sə'spekt] vt.认为；怀疑 ['sʌspekt] n．被怀疑者；嫌疑犯

　　\s\up1(22(22)hit vt.(厄运、灾难等)突然袭击；侵袭

　　\s\up1(23(23)enquiry [In'kwaIərI] n．询问

　　\s\up1(24(24)as在句中引导时间状语，意为"当......时候"。

　　\s\up1(25(25)neighbourhood ['neIbəhʊd] n．附近；邻近

　　\s\up1(26(26)severe [sI'vIə] adj.严重的；剧烈的；严厉的

　　\s\up1(27(27)so ... that ..."如此......以至于......"

　　\s\up1(28(28)be determined to do下定决心做

　　 [第3段译文]

　　约翰·斯诺推测第二种理论是正确的， 但他需要证据。因此，在1854年伦敦再次暴发霍乱时，约翰·斯诺就准备开始他的调查。当霍乱在贫民区迅速蔓延的时候，他就开始收集资料。在两条特定的街上霍乱流行得很严重，以至于10天内就有500多人死亡。他决心要查明原因。

　　First he marked on\s\up1(29(29) a map the exact places where all the dead people had lived\s\up1(30(30). This gave him a valuable clue\s\up1(31(31) about the cause of the disease. Many of the deaths\s\up1(32(32) were near the water pump\s\up1(33(33) in Broad Street\s\up1(34(34) (especially numbers 16, 37, 38 and 40)．He also noticed that some houses (such as 20 and 21 Broad Street and 8 and 9 Cambridge Street\s\up1(35(35)) had had no deaths. He had not foreseen\s\up1(36(36) this, so he made further investigations\s\up1(37(37). He discovered that these people worked in the pub at 7 Cambridge Street. They had been given free beer and so had not drunk the water from the pump. It seemed that\s\up1(38(38) the water was to blame\s\up1(39(39).

　　Next, John Snow looked into\s\up1(40(40) the source of the water for these two streets. He found that it came from the river polluted\s\up1(41(41) by the dirty water from London. He immediately told the astonished people in Broad Street to remove the handle\s\up1(42(42) from the pump so that it could not be used\s\up1(43(43). Soon afterwards the disease slowed down\s\up1(44(44). He had shown that cholera was spread by germs\s\up1(45(45) and not in a cloud of gas.

　　\s\up1(29(29)mark ... on ...把......标在......上

\s\up1(30(30)where引导定语从句，修饰先行词places。