umbilicalis脐带umbilicaladj.脐带的；关系亲密的Umbilical cord blood transplantation脐血移植Umbilical cord mesenchymal stem cells脐带间充质干细胞umbilical cord blood mononuclear cells单个核细胞,脐血umbilical omphalomesenteric duct polyp脐部卵黄管息肉umbilical artery blood stream velocity脐动脉血流速度umbilical vein vascular endothelial cells脐静脉内皮细胞umbilical cord-derived mesenchymal stem cell脐带源间充质干细胞umbilical artery blood systolic/diastolic ratio脐血流S/D值