?替用通信设施
... way alternate communication 双向交替通信 alternate communication facility 替用通信设施 two way alternate communication 半双工传输 ...
?备用通信设备
备用通信设备 alternate communication facility; stand by communication facility 备用通信设施 alternate communications facility .
英汉双解词典包含3185865条英汉词条,基本涵盖了全部常用单词的翻译及用法,是英语学习的有利工具。