单词	hole collar
释义	hole collar 炮眼口,钻孔口
随便看	railtrain dispatch system rail train dispatch system rail transfer Rail Transfer Equipment railtransit rail transit rail-transit rail tran-sit rail transit building in chongqing Rail Transit Complex rail transit construction rail transit engineering rail transit equipment manufacturing industry Rail Transit Hub rail transit in the world rail transit network rail transit network morphology Rail transit planning rail transit project rail transit specialities rail transit station rail transit stations Rail transit traffic rail transit vehicle event recorders rail transit viaduct