Causion of chronic diarrhea changes to polyarchy from infection, non - infectious factor is more and more.

慢性腹泻病因也由感染为主转变为多元化, 非 感染性原因越来越多.

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Firstly, by abundant investigations the causion and the hazard of surcharge is systematic analysised.

首先通过大量的调研,系统分析了超载产生原因及其危害性.

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