Ringing a telephone now requires copper wire from the central exchange to the home . 目前的电话铃声则需要靠从中心交换台通到用户家中的铜线进行工作。
Then switchboards brought phone wires into one location 然后,交换台使电话线集中到一个地点。
He telephoned the hospital exchange and asked for doctor millington 他挂通了医院的交换台,要求与米灵顿医生讲话。
When he was alone , he telephoned the hospital exchange and asked for doctor millington 当房里只剩他一个人时,他挂通了医院的交换台,要求与米灵顿医生讲话。
One that announces , especially an electrical signaling device used in hotels or offices to indicate the sources of calls on a switchboard 信号器,示号器宣告物,尤指饭店或办公室中使用的一种电子信号装置,用来指示交换台上的呼叫信号来源