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不是自转减缓，而是月球自转和地球自转同步，所以总是有一面无法直接观测到。
ding_ding
(丁_丁)
(#11864938@0)
Last Updated: 2019-1-3
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完成人类史航天史上的一项壮举，嫦娥四号成功着落月球背面！
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