secondary tin再生锡secondaryadj.次要的；从属的；中等教育的n.副手；次要位置secondary terminal高压终端secondary variance次要变异secondary priority第二位secondary mycelium次生菌丝体secondary creation二度创作secondary variable辅助变量secondary reaction副反应secondary cleaning二次清洗secondary analysis二级分析secondary ripening二次成熟