So aligned, the needle can then inject its payload painlessly into the stomach wall.

对齐之后，针头就可以无痛地将药物注入胃壁。

A multitude of nerves wrapped intricately around the stomach wall sense the stretching.

大量错综复杂地缠绕在胃壁周围的神经会感觉到拉伸。

That propels the food into the stomach, where it's left at the mercy of the muscular stomach walls, which bound the bolus, breaking it into chunks.

这将食物推入胃中，在那里它受肌肉胃壁的支配，胃壁束缚了食团， 将其分解成块。

Hormones, secreted by cells in the lining, trigger the release of acids and enzyme-rich juices from the stomach wall that start to dissolve the food and break down its proteins.

由内壁细胞分泌的激素会触发胃壁释放酸和富含酶的汁液，这些汁液开始溶解食物并分解其蛋白质。