yolk sac

• n. (=yolk bag)[动]卵黄囊

英英释义

Noun:

1. membranous structure that functions as the circulatory system in mammalian embryos until the heart becomes functional

2. membranous structure enclosing the yolk of eggs in birds, reptiles, marsupials, and some fishes; circulates nutrients to the developing embryo

例句

用作名词 (n.)

1. The yolk sac is gradually vascularized.
   卵黄囊逐渐被血管化了。
2. The dye Trypan Blue has a remarkable biphasic effect on pinocytosis by yolk sal.
   染料锥虫蓝对卵黄囊的胞饮作用具有明显的双向作用。

近反义词

【近义词】

• vitelline sac 卵黄囊
• umbilical vesicle 脐囊