溃疡的
A bacterium is identified as the cause for his duodenal ulcer. 一种细菌被断定为造成他十二指肠溃疡的根源。
A positive diagnosis can be made only after ruling out gastric and duodenal ulcer. 只有排除了胃溃疡和十二指肠溃疡的可能性之后，才能作出明确诊断。
