短語詞組短語Tie -Line Trunk 聯(lián)絡線乾線Tandem Tie Trunk Switching 中繼聯(lián)絡乾線交換tie trunk TTK 連結(jié)乾線private branch exchange tie trunk 專用小交換機直通中繼線Trunk Tie 軀乾系帶 返回 tie trunk