elusive ulcer

例句：

1. 1. He had a stomach ulcer that required surgery.
   他患有胃溃疡，需要进行手术。
2. 2. The doctor prescribed medication to treat the patient's ulcer.
   医生开药治疗病人的溃疡。
3. 3. The patient was advised to avoid spicy foods and acidic drinks to prevent further ulcers.
   患者被建议避免辛辣食物和酸性饮料，以防止进一步的溃疡。