在电信中心办公室和交换中心安装工机电，模拟和数字集群系统，电路和设备。
Install electromechanical, analog and digital trunking systems, circuits and equipment in telecommunications central offices and switching centres.
电信工程师正在努力解决我们当地电话交换中心的一个问题。
The telecom engineer is working hard to solve a problem at our local telephone exchange.
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