1、A duodenal ulcer is an ulcer that occurs in the lining of the duodenum, the first part of the small intestine.
（十二指肠溃疡是发生在十二指肠内壁的溃疡，是小肠的第一部分。）

2、The patient was diagnosed with duodenal inflammation and was prescribed medication to reduce the inflammation.
（患者被诊断为十二指肠炎，并开了药物来减轻炎症。）