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線收費。 - A private telephone exchange that automatically connects internal "branch" lines to the external circuits of a telephone system.
一種自動地將內部用戶線連接到電話系統外線的專用電話交換機。
