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yolk sac英英字典_yolk sac剑桥英语解释_yolk sac柯林斯英文解释_欧米惠必应词典
欧米惠必应词典

yolk sac

Y 开头单词

柯林斯词典

    yolk sac

  • 1. N the membranous sac that is attached to the ventral surface of the embryos of birds, reptiles, and some fishes and contains yolk 卵黄囊[zoology]

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