高速电子洗牌机l:13710079688.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）等结构的解剖关系。图片来源：路易斯·巴里奥斯的《哺
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