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  1. amnion

    • IPA[ˈamnēän]

    美式

    • n.
      the innermost membrane that encloses the embryo of a mammal, bird, or reptile.
    • noun: amnion, plural noun: amnia

    • 更多解釋
    • IPA[ˈamnɪən]

    英式

    • n.
      the innermost membrane that encloses the embryo of a mammal, bird, or reptile.

    Oxford Dictionary