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日本一家公司出售一种供小船和游船用的小型卫星地球站,型号为JIE-45A。这种地球站的体积只有普通卫星地球站的一半,重量也只有2/5,因而它
A Japanese company sells a small satellite earth station for boats and cruise ships, model JIE-45A. This earth station is only half the size of an ordinary satellite earth station and weighs only 2/5, so it