secondary end次级端secondaryadj.次要的；从属的；中等教育的n.副手；次要位置secondary order curve二次曲线secondary integration二次整合secondary institution次级制度Secondary Boot Loader二级引导加载程序secondary aggregation二次凝聚secondary copper ores次生铜矿物secondary positioning二次定位secondary regulations二级规则secondary perfect set次完美集合secondary obstruction第二障碍