短語詞組短語Tie -Line Trunk 聯(lián)絡(luò)線干線Tandem Tie Trunk Switching 中繼聯(lián)絡(luò)干線交換tie trunk TTK 連結(jié)干線private branch exchange tie trunk 專用小交換機(jī)直通中繼線Trunk Tie 軀干系帶 返回 tie trunk