a telephone service in which a group of phone lines can be joined by part of the local exchange acting as a private exchange
中心交换(一种电话服务项目,用起专用交换机作用的市话交换机的一个组成部分连接多条电话线)。
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centrexn.中心交换
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centren.中心;心;集中之处;(Centre)中央大区;中锋
"late 20th cent.: blend of