以下为句子列表：
英文: A 39year-old man presented with a deep-seated nodule with central ulceration of the upper lip for a three-month duration.
中文: 一个39岁的男病人，在上唇深处有一颗持续三个月的结节，后来其表面的中央生成溃疡。
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英文: Here, an ill-defined mass at the gastroesophageal junction produces mucosal ulceration and irregularity, which led to the clinical symptoms of pain and difficulty swallowing.
中文: 图示胃食管交界处有性质不明的肿块，可见溃疡形成和不规则黏膜，临床表现为疼痛和吞咽困难。
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英文: Here, the mucosa shows ulceration and undermining by an extensive neutrophilic exudate.
中文: 粘膜显示有溃疡和广泛的中性粒细胞渗出物引起的破坏。
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英文: Methods Preparing the CAPF by the methods of even thick liquid making films and observing the effect of CAPF on oral ulceration of rat stimulated by phenol.
中文: 方法采用匀浆制膜法制备复方芦荟多糖膜剂，然后观察复方芦荟多糖膜剂对石炭酸造成大鼠口腔溃疡的药效。
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英文: Peptic ulceration occurs in the stomach and duodenum. Both acute and chronic forms are founded, the latter being more common.
中文: 消化性溃疡包括胃溃疡和十二指肠溃疡。分为急性、慢性两种，并以后者较为常见。
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