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https://gizmodo.com/5597169/arthur-c-clarke-wrote-a-letter-predicting-gps-and-satellite-tv-in-1956
您即将离开知乎,请注意您的帐号和财产安全。
https://gizmodo.com/5597169/arthur-c-clarke-wrote-a-letter-predicting-gps-and-satellite-tv-in-1956