疟疾

例句：

1. 1.Malaria is a serious disease that can be transmitted by mosquitoes.
   疟疾是一种严重的疾病，可以通过蚊子传播。
2. 2. Many people in Africa are at risk of contracting malaria due to the high population density and poor sanitation.
   由于人口密度高和卫生条件差，许多非洲人面临着感染疟疾的风险。
3. 3. The World Health Organization recommends preventive measures to reduce the incidence of malaria.
   世界卫生组织建议采取预防措施以减少疟疾的发病率。