secondaryadj.次要的；从属的；中等教育的n.副手；次要位置secondary axis副光轴,副轴,次轴secondary file二次文件,辅助文件secondary word二度组合词secondary copy辅副本secondary pole次极secondary cyst次生囊secondary weir副堰,辅助堰secondary flat次平面secondary wood次生木材secondary flow二次流