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  1. Oxford American Dictionary

    glacial period

    • IPA[ˈɡlāSHəl ˈpirēəd]
    • n.
      a period in the earth's history when polar and mountain ice sheets were unusually extensive across the earth's surface.

    • noun: glacial period, plural noun: glacial periods

    • 更多解釋

    glacial period

    • n.
      a period in the earth's history when polar and mountain ice sheets were unusually extensive ...

    Oxford Dictionary