vitelline sac

常見例句

• The yolk sac is gradually vascularized.
  卵黃囊逐漸被血琯化了。
• 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(xì)胞入綴生殖峭而形成。
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