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vitelline sac的英文翻译是什么意思，词典释义与在线翻译：
英英释义
Noun:
-
membranous structure that functions as the circulatory system in mammalian embryos until the heart becomes functional
vitelline sac的用法和样例：
例句
- The yolk sac is gradually vascularized.
卵黄囊逐渐被血管化了。 - The gonads form from a group of large granulated yolk sac cells which invacle the germinal ridges.
性腺是由一群大的颗粒的卵黄囊细胞入缀生殖峭而形成。
