exchange line

• 用户线

exchange line的用法和样例：

例句

1. New charges proposed by the regional Bell holding companies to supplement subscriber line charges.
   地区贝尔控股公司提议增加新的收费以补充用户线收费。
2. A private telephone exchange that automatically connects internal "branch" lines to the external circuits of a telephone system.
   一种自动地将内部用户线连接到电话系统外线的专用电话交换机。