所以这个数字包括已连接的主线和用于将来连接的可用主线数，包括交换技术操作主线(测试号码)。
This number includes, therefore, main lines already connected and main lines available for future connection, including those used for the technical operation of the exchange (test Numbers).
你可能知道，房间号码的第一个数字代表楼数。
As you may know, the first figure of the room number stands for the floor.
你可能知道，房间号码的第一个数字代表楼数。
As you may know, the first figure of the room number stands for the floor.
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