英语语法分析

Walking keeps you upright and enlists gravity to keep acids from splashing up the esophagus.

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。

The surface of the esophagus was highly rugous.

食道腔面高度皱褶。

The esophagus also lies in front of parts of the hemiazygos veins.

食道也位于半奇静脉的前面。