Endorsement must however be sought in advance for the specific type of dutiable commodities to be imported or exported ( a special import licence is for keepers of licensed warehouses capable of storing not less than 500 kilolitres of hydrocarbon oil ) 然而却必须就将予进口或出口之某种应课税品而事先取得签注(特别进口牌照是发给能贮存不少于500千升碳氢油的私用保税仓管理人) ;