循环系统与排泄系统组织结构上的紧密联系有利于代谢产物的排泄。
The close connection between circulatory system and excretory system in histological structure contributes to discharge of metabolite.
表明内源排泄物中代谢粪氮的能值与尿的能值不同，粪中氮的能值高于尿中氮的能值。
It indicated that energy of endogenous nitrogen was different to that of uric acid, the energy of endogenous nitrogen was higher.
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