preferentialist关税特惠主义者preferentialadj.优先的；优待的；特惠的preferential regulation优惠政策Preferential duty rates优惠利率preferential attachment优先连接preferentialsegregation偏向分离preferential adsorption选择性吸附preferential expression优先表达preferential nucleation择优成核preferential reflection选择反射preferential combustion优先燃烧preferential deformation择优取向变形