African typanosomiasis nagana

例句：

1. 1. The villagers were devastated by the sudden outbreak of nagana.
   村民们对突然爆发的疟疾感到震惊。
2. 2. The doctor prescribed medication to treat nagana.
   医生开了药来治疗疟疾。
3. 3.Many people in Africa are at risk of contracting nagana due to poor sanitation conditions.
   由于卫生条件差，许多非洲人面临着感染疟疾的风险。