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美国国防部将开始预研一个大型卫星预警系统。这个系统将以卫星为基地,采用宽达20米的光学结构系统和多种感测器,其中包括有电视和红外装置,对
The U.S. Department of Defense will begin pre-researching a large satellite warning system. The system will be satellite based with an optical structure of up to 20 meters and a variety of sensors, including television and infrared devices,