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新款磨砂帶毛刷發牌靴l:13710079688 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）等结构的解剖关系。图片来源：路易斯·巴里奥斯的《哺乳动物的脐带组织学》 %CD%B8%C3%F7%B6%FE%D5%C5%D1%A5%2D%A1%BE%40%31%33%37%31%30%30%37%39%36%38%38%A1%BF
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