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可控庄闲发牌器合作l:13710079688t-picture" src="//inews.gtimg.com/newsapp_bt/0/13416677906/1000">脐带横断面示意图. 展示了脐动脉（Umbilical arteries）、脐静脉（Umbilical vein）、脐尿管（Allantoic duct）等结构的解剖关
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