anorectal infection

例句：

1. 1. He developedan anal infection after a trip tothe hospital.
   他在去医院后患上了肛门感染。
2. 2. The doctor prescribed antibiotics for hisanal infection.
   医生给他开了抗生素治疗他的肛门感染。
3. 3. Anorectal infectionscan be difficult to treat and require closemonitoring.
   肛门感染难以治疗，需要密切监测。