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2022-03-13... 全球卫星夜光图的朝鲜半岛部分,从图中我们可以朝鲜半岛南北韩国和朝鲜的差异。朝鲜除了首都平壤有光亮外,其余地区几乎漆黑一片。而反观韩国,除了首都首尔地区一大片光亮之外,全国其它重要城市如大邱、釜山等也清晰可见。"... 419
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2021-04-12...We’re excited to have you join us. Sketchpad is a one of a kind web-based sketching tool for teachers, students, artists, and other individuals. It is simple to... 286
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