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