fixed line number

例句：

1. 1. The company uses a fixed linenumber to identify its customers.
   该公司使用固定线路编号来识别其客户。
2. 2. The phone numberis on the back of the business card, with a fixed line number.
   电话号码在名片背面，有一个固定线路编号。
3. 3. The fixedline number is used to connect two devicestogether.
   固定线路编号用于将两个设备连接在一起。