secondary dam副坝secondaryadj.次要的；从属的；中等教育的n.副手；次要位置secondary adhension继发性粘连secondary digestion二次消化secondary induction次级感应secondary involucre分总苞Secondary-circuit二回路secondary pneumonia继发性肺炎secondary flotation二次浮选secondary sterility继发不育secondary chemicals次生代谢物secondary mortgages二次按揭