- the act or an instance of oscillating
- 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
| 单词 | libration |
| 释义 | WordReference Random House Unabridged Dictionary of American English © 2024 li•bra•tion (lī brā′shən),USA pronunciation n. [Astron.]
Collins Concise English Dictionary © HarperCollins Publishers:: libration /laɪˈbreɪʃən/ n
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