Humans normally carry several pounds of bacteria in their intestines and they are key to digestion, immune system function and possibly play other beneficial roles.

正常人肠道内可以携带大概约几磅重的细菌，这些细菌在食物消化和免疫系统功能的发挥中起到重要的作用，并且很可能是有益的作用。

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Objective: Further to determine that the small intestines have the function of elimination.

目的：为进一步确定小肠是否具有排泄功能。

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As a kind of active substance, the exogenous nucleotides can affect the function of stomach and intestines, the development of hepar, the metabolism of lipid and the immune system of creature.

介绍了外源核苷酸作为一种活性物质，对胃肠道的功能、肝脏生长与发育、脂质代谢、动物体免疫系统等具有重要影响。

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