If it passed directly through the tube and nothing happened to it, it would come out to the outside world again.
如果它直接穿肠而过,中间没有任何事情发生,它又会回到外面去
One can imagine that when they're inside this tube here, they're still really outside the body.
你可以想到当食物在肠管的时候,实际上还是处在体外的
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