The traditional methods are radio, telephone line and leased line.
传统的方法是使用无线电台、电话线或专用通信线。
Telephone system : Every 40-square-meter leased area is supplied with one telephone line.
电话系统 ：每租赁面积40平方米提供一条电话线。
Telephone system : Every 40-square-meter leased area is supplied with one telephone line.
电话系统 ：每租赁面积40平方米提供一条电话线。
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