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单词 天平动
例句 DEFINITIVE EXAMPLES 权威例句〔libration〕A very slow oscillation, real or apparent, of a satellite as viewed from the larger celestial body around which it revolves.天平动:卫星的真正或是表面上的缓慢摆动,可以从卫星所公转的较大天体上观测到美国传统
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