胃酸（gastric acid）指胃液中的分泌盐酸。人胃是持续分泌胃酸的，其基础的排出率约为最大排出率的10%，且呈昼夜变化，入睡后几小时达高峰，清晨醒来之前最低。当食物进入胃中时，胃酸即开始分泌。胃在排空时pH值约在7.0～7.2之间，当食团进入胃中时，pH值可降达2～3之间。
Esophageal mucosa and its secretary mucus can prevent injuries caused by gastric acid,bile salt,and oth- er chemical materials.
正常生理状态下食管黏膜和食管黏膜分泌的黏液能抵抗胃酸、胆盐及其他化学物质的损害,起到重要的屏障作用。
参考来源 - 食管屏障功能和胃食管反流病·2,447,543篇论文数据，部分数据来源于NoteExpress
胃酸腐蚀胃壁时，就出现了溃疡。
Ulcers occur when the stomach's natural acids eat into the lining of the stomach.
直到最近，Presorbin 和 Veltrex 这两种用于阻止胃酸分泌过多的药物，都只有医生开处方才能买到。
Until very recently, Presorbin and Veltrex, two medications used to block excess stomach acid, were both available only with a prescription written by a doctor.
散步可以帮助你直立和获得地心重力的作用，去防止胃酸上溅到食道上。
Walking keeps you upright and enlists gravity to keep acids from splashing up the esophagus.
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