exchange line的用法和樣例：
例句
- New charges proposed by the regional Bell holding companies to supplement subscriber line charges.
地區貝爾控股公司提議增加新的收費以補充用戶(hù)線(xiàn)收費。 - A private telephone exchange that automatically connects internal "branch" lines to the external circuits of a telephone system.
一種自動(dòng)地將內部用戶(hù)線(xiàn)連接到電話(huà)系統外線(xiàn)的專(zhuān)用電話(huà)交換機。
