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vitelline sac的英文翻譯是什麼意思，詞典釋義與在線翻譯：
英英釋義
Noun:
-
membranous structure that functions as the circulatory system in mammalian embryos until the heart becomes functional
vitelline sac的用法和樣例：
例句
- The yolk sac is gradually vascularized.
卵黃囊逐漸被血管化了。 - The gonads form from a group of large granulated yolk sac cells which invacle the germinal ridges.
性腺是由一群大的顆粒的卵黃囊細胞入綴生殖峭而形成。
