| 单词 | libration |
| 释义 | Word Frequency libration(laɪˈbreɪʃən) noun 1. the act or an instance of oscillating 2. a real or apparent oscillation of the moon enabling approximately 59 per cent of the surface to be visible from the earth over a period of time Derived forms librational (liˈbrational) adjective Word origin C17: from Latin librātus, from librāre to balance |
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