secondaryadj.次要的；从属的；中等教育的n.副手；次要位置secondary acid二级酸secondary cost间接费用secondary yard辅助调车场secondary mark[医] 继发性标(牙)secondary case继发病例secondary lobe旁波瓣secondary gain再度获益Secondary bulb次生鳞茎secondary rays[医] 次生射线, 次级射线secondary unit辅助热交换器