短語詞組短語extension n telephone set 電話分機extension telephone set 電話分機Extension of international telephone services 國際電話業(yè)務(wù)的擴展extension telephone set telephone extension 電話分機telephone extension 電話分機extension of base field telephone 并接電話extension number of a telephone 電話分機號碼fire telephone extension 消防電話分機 返回 extension telephone