常見例句雙語(yǔ)例句Conclusion There was an anastomosis among umbilical vein . portal vein and ductus venosus by portal sinus .結(jié)論臍靜脈、門靜脈、靜脈導(dǎo)管之間在胎兒肝門處存在吻合， 吻合處為門竇。 返回 sinus venosus