Others protect the lining of the stomach and small intestine.

VOA: special.2009.10.20

What happens in the intestine is that food gets broken down into constituent molecules, some of those molecules are absorbed into our bodies.

在肠道中,食物必须分解成基本的组成分子,其中一些分子才能被我们的身体吸收

耶鲁公开课 - 生物医学工程探索课程节选

There's a continuous path from the outside world right through the intestine.

从体外经由肠道的路径,是一条连贯的通道

耶鲁公开课 - 生物医学工程探索课程节选