secondaryadj.次要的；从属的；中等教育的n.副手；次要位置secondary pest次要病虫害secondary dike副堤secondary rule次要规则secondary bast次生韧皮部secondary area副区secondary ring次环secondary peak第二波峰,副峰secondary seal二级封闭secondary main[电] 低压干线secondary crop次要作物