Of course when molecules get absorbed through the intestinal tract they become part of your internal environment.

当然,分子在被肠道吸收后,就成为身体内环境的一部分

耶鲁公开课 - 生物医学工程探索课程节选

This diagram is supposed to make you think about the intestinal tract, this tube that runs through our bodies and allows us to acquire nutrients from the environment.

这幅图意在,让你们考虑一下肠道,这个贯穿我们身体的管道,使我们能够从环境中吸收营养

耶鲁公开课 - 生物医学工程探索课程节选