短語(yǔ)詞組短語(yǔ)trunk line carrier channel 長(zhǎng)途乾線載波信道exchange trunk carrier system 侷間中繼線載波系統(tǒng)exchange acidity trunk carrier system 侷間中繼線載波系統(tǒng)Carrier Trunk 載波中繼 返回 trunk carrier