ague

例句：

1. 1. He caught a severe case of malaria while traveling abroad.
   他在旅行时患上了严重的疟疾。
2. 2. The doctor prescribed him medication to treat his malaria.
   医生给他开了药来治疗他的疟疾。
3. 3. Malaria is a serious disease that can be prevented by using mosquito nets and avoiding mosquito bites.
   疟疾是一种严重的疾病，可以通过使用蚊帐和使用避免蚊虫叮咬的方法来预防。