人的生活离不开营养物质和氧气同时还需要排出体内产生的代谢废物人体是一 个统一的整体各个系统之间存在着密切的联系下图是人体进行消化吸收 Template




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tomski人的生活离不开营养物质和氧气同时还需要排出体内产生的代谢废物人体是一 个统一的整体各个系统之间存在着密切的联系下图是人体进行消化吸收 coloring