Humans are a large animal with a very small gut, so we need to maximize the bang-for-the buck when it comes to what we eat.

人类是一种拥有特别的小肠的大型动物，所以我们要很在意吃的东西。

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This had a skeleton much like modern man's—a big, brain-filled skull and a narrow pelvis and rib cage, which imply a small abdomen and thus a small gut.

他们的骨骼与现代人的十分相似：拥有较大脑容量的头骨、骨盘和胸腔较窄，这意味着较小的腹部和肠道。

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The Edmonton-based researchers used a model system of the stomach and small intestine to simulate human gut conditions.

埃德蒙顿的研究人员使用了一种模型系统的胃和小肠，以模拟人类肠道条件。

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If future experiments prove that such genes are essential to the bacterium's happy existence in the gut, then small molecules might be administered to block this pathway and make El Tor's life rather more difficult.

ECONOMIST: The cholera genome

Mathur focused on detecting methane in the breath, since animal studies found that the presence of a certain family of organisms called archaea, which are older than bacteria and colonize the gut, was linked with weight gain and conveniently released small amounts of methane gas.

CNN: Can you smell obesity?

His new shrunken stomach was then attached further down his small intestine, to a section known as the ileum which secretes a different gut hormone, PYY, which is responsible for making you feel full.

BBC: The second brain in our stomachs