Cancer may also occur on inner surface of body, such as gastric ulcer, duodenitis, rectitis and so on.
生在身体内表面，如胃溃疡，十二指肠溃疡，直肠溃疡
。
Cancer may also occur on inner surface of body, such as gastric ulcer, duodenitis, rectitis and so on.
生在身体内表面，如胃溃疡，十二指肠溃疡，直肠溃疡。
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