ring corneal ulcer

例句：

1. 1. He developed a ring corneal ulcer after an accident.
   他在一次事故后患上了角膜溃疡。
2. 2. The doctor advised him to take antibiotics for the ring corneal ulcer.
   医生建议他服用抗生素治疗角膜溃疡。
3. 3. The patient was in pain and had to wear special glasses to treat the ring corneal ulcer.
   病人疼痛难忍，不得不佩戴特殊眼镜来治疗角膜溃疡。