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