knowndoctorinLondonJ的精选

问题详情：Asawell-knowndoctorinLondon,JohnSnowwaswillingtohelpordinarypeople  61  (expose)tocholera（霍乱）.Heknewthatonlywhen  62  causeofitwasfoundcouldthe  63 (dead)diseasebecontrolled.Hehastw...