In the firstone. black clouds of exhaust fume are emitted from a highchimney. to thes trend one. a signal tower stands instead ofthe ugly chimney. sending out invisible harmful radiation.

第二幅图中一座信号塔取代了丑陋的烟囱。放射出无形的有害辐射。

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Then through the use of GPS-based reference clocks at each tower (for both time and frequency), the signals are synced so each can emit a perfect copy of both signal and symbol data.

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