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1. Oxford Dictionary

   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 often not visible from the earth sometimes come into view.

   • noun: libration, plural noun: librations

2. • 更多解釋

   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 ...

   Oxford American Dictionary