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先进跟踪与数据
中继
卫星系统
advanced track and data relay satellite system
国防通信
中继
系统
defense communication system relay
国防部数据
中继
卫星系统
Department of Defense data relay satellite system
火星气球
中继
实验
Mars balloon relay experiment
跟踪与数据
中继
卫星
tracking and data relay satellite
跟踪与数据
中继
卫星系统
tracking and data relay satellite system
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