Ulcers occur when the stomach's natural acids eat into the lining of the stomach.
胃酸腐蚀胃壁时，就出现了溃疡。
Some drugs can irritate the lining of the stomach.
有些药物会刺激胃内壁。
Recently physicians have determined that stomach ulcers are not caused by stress, alcohol, or rich foods, but a bacterium that dwells in the mucous lining of the stomach.
最近，医生们发现胃溃疡不是由压力、酒精或油腻的食物引起的，而是由一种存在于胃粘膜内壁的细菌引起的。
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