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你知道吗？通信卫星不仅能打电话，还能做这些神奇的事情！
你有没有想过，当你用手机打一个国际长途电话，或者用电脑看一个来自外国的视频直播，是怎么实现的呢？答案就是：通信卫星！
宇宙知识探秘162/345
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