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考研英语阅读理解：太阳系内速度限制免费下载，
n neighbours, cannot be extended into space. It will never be possible to converse with anyone on another planet. Even with today's radio equipment, the messages will take minutes—sometimes hours—on their journey, because radio and light waves travel at the same limited speed of 186, 000 miles
考研英语阅读理解：太阳系内速度限制
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