词汇	交换系统
释义	交换系统医switching system
随便看	railway passenger vehicle Railway Period for Conveyance Railway Period for Departure railway permanent ways maintaining railway personnel railway pier railway pile drivers railway pivot railway plan railway planning railway plans railway planting railway platform railway platform roof railway platform truck railway pluralistic operation enterprises railway point of frogs railway points railway police railway police education railway police english railway police officer railway policy railway pontoon bridge equipment railway porter