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  1. 奧陶紀

    • zhuyin[ㄠˋㄊㄠˊㄐㄧˋ]
    • pinyin[aotaoji]
    • [Geology] the Ordovician period; Ordovician
    • 更多解釋
    • pinying[Ao4 tao2 ji4]
    • Ordovician (geological period 495-440m years ago)

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