preferentialadj.优先的；优待的；特惠的preferential clause特惠条款preferential repair优先修复preferential debtor[法] 优先债务人preferential choice优选preferential ballotn.选择选举制的选票preferential tariff特惠税率,关税特惠preferential hiring[经] 优先雇用preferential margin优惠差幅preferential prices优惠价格preferential attack择优侵蚀