relaysetn.继电器组(继电器装置)relayvt.转播；转达；中继；接力；接替n.继电器；接力赛；替班relay aircraft中继转信飞机relay distance中继距离relay topology接力式结构relay runction继电器功能relay feedback继电反馈relay act trip继电器操作跳闸relay circuity继电器电路学relay assembly继电器组合relay receiver转播用接收机,接力接收机relay networks中继网络