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  1. Oxford American Dictionary

    libration

    • IPA[līˈbrāSHən]

    美式

    • n.
      an apparent or real oscillation of the moon, by which parts near the edge of the disc that are often not visible from the earth sometimes come into view.

    • noun: libration, plural noun: librations

    • 更多解釋

    libration

    • IPA[lʌɪˈbreɪʃn]

    英式

    • n.
      an apparent or real oscillation of the moon, by which parts near the edge of the disc that are ...

    Oxford Dictionary