The recent outbreaks of cholera are a timely reminder that this disease is still a serious health hazard.最近霍乱的爆发及时提醒了人们该疾病仍然会严重危害健康。The conditions under which field outbreaks take place are fairly defined.在野外情况下的发病已充分肯定....
The recent outbreaks of cholera are a timely reminder that this disease is still a serious health hazard...最近霍乱的爆发及时提醒了人们该疾病仍然会严重危害健康。The recent outbreaks of cholera are a timely reminder that this disease is still a ser...