基本解释行李舱支架;行李搬运车;载波中继词组短语短语trunk line carrier channel 长途干线载波信道exchange trunk carrier system 局间中继线载波系统exchange acidity trunk carrier system 局间中继线载波系统Carrier Trunk 载波中继trunk carrier更多词组专业释义交通运输工程行李舱支架