And when that moment arrives, what was once food says farewell to the alimentary canal that temporarily held it, and passes back into the light of day.

当那一刻到来时，曾经的食物告别了暂时支撑它的消化道，回到了光天化日之下。

Gut microbial health, once a fringe medical interest, is now mainstream for human beings, as bugs in the alimentary canal are linked with conditions ranging from obesity to arthritis.

肠道微生物健康曾经是一种边缘医学关注点，现在已经成为人类的主流，因为消化道中的细菌与肥胖、关节炎等一系列疾病有关。

And this brings me to your crucial accessory organs — the things apart from the alimentary canal that never come in contact with ingested material, but still play an essential role in digestion.

这就把我带到了你至关重要的附属器官——除了消化道之外的东西，它们永远不会与摄入的物质接触，但在消化过程中仍然起着至关重要的作用。

Smooth muscles are used to control the flow of substances within the lumens of hollow organs, for examples, blood vessels and the alimentary canal, and are not consciously controlled.

平滑肌用于控制空腔器官内物质的流动，例如血管和消化道，并且不受意识控制。

And here, the accessory digestive organs — namely, the liver, pancreas and gallbladder — secrete enzymes into the alimentary canal, where they ambush the mush and break it down into its most basic chemical building blocks.

在这里，辅助消化器官——即肝脏、胰腺和胆囊——向消化道分泌酶，在那里它们伏击糊状物并将其分解成最基本的化学成分。

The large intestine — consisting of the colon, rectum, and anus — is relatively short, at about one and half meters, and it provides a nice little frame for the small intestine, here at the end of the alimentary canal.

大肠——由结肠、直肠和肛门组成——相对较短，大约 1.5 米，它为小肠提供了一个漂亮的小框架，在消化道的末端。