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光和影子的关系
更新时间: 2020-08-15 00:00:00  

光沿直线传播,当遇到不透明的物体时便被挡住了,在地上形成一个一部分光不能到达的区域,这个区域就显得暗些了,于是形成了影。

关键词: 影子 关系

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