耀久九英英词典

vitelline sac

V 开头单词

同根派生

     

英汉例句

  • 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胞入綴生殖峭而形成。