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5件你未必知道的宇宙事实
小小的银河系，在东方，它叫“星河”“天汉”。在西方，它叫“Milky way”“Galaxy”。EyeOpener今日话题，银河系的五个小故事。
这么多冷知识：那些理所当然背后的深意23/115
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