词汇 | libration |
释义 | libration noun [ U ] physics specialized uk/laɪˈbreɪ.ʃən/ us/laɪˈbreɪ.ʃən/ (行星的)天平动 a slight backwards and forwards movement of something, especially of planets etc. in the sky lunar libration 月球的天平动 Synonym: oscillation |
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