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字词 脐带
释义 脐带qídài连接胚胎与胎盘的带状物,由两条动脉和一条静脉构成。胚胎依靠脐带与母体联系,是胚胎吸取养料和排出废料的通道。{umbilical cord, consisting of two arteries and one vein, connecting the fetus with the placenta of the mother and transmitting nourishment from the mother and discharging wastes from the fetus}
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