我们必须保持所有的通讯线路畅通。
邮电通讯线路、电力电线保护套管。
Postal telecommunications lines and power cable protection sleeve.
请检查通讯线路是否连通并处于活动状态。
Please verify that the communications line is connected and active.
呼叫被取消，因为通讯设备驱动程序关闭了此线路。
Your call was canceled because the telephony device driver closed the line.
呼叫被取消，因为通讯设备驱动程序关闭了此线路。
Your call was canceled because the telephony device driver closed the line.
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