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单词 参照物
释义 〔retrograde〕Of or relating to the brief, regularly occurring, apparently backward movement of a planetary body in its orbit as viewed against the fixed stars, caused by the differing orbital velocities of Earth and the body observed.后退的:行星所做的短暂有规律的运动的,以静止星体为参照物进行观察时,这种运动显然是后退的,这是由地球和所观察天体具有不同的轨道速度引起的〔thing〕Something referred to by a word, a symbol, a sign, or an idea; a referent.东西:用文字、符号、标志或思想指代的事物;参照物
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