secondary school中等学校

secondary market二级市场；次级市场

secondary pollution二次污染

secondary education中等教育

secondary industry第二产业，次级产业

technical secondary school中专学校

secondary flow二次流

secondary structure二级结构；次生结构

secondary vocational school中等职业学校

secondary air[化]二次风；二次空气

secondary refining二次精炼

secondary forest[林]次生林；再生林

secondary circuit二次电路，次级电路

secondary treatment二级处理；次级处理

secondary voltage二次电压

secondary battery二次电池；蓄电池

secondary processing二次加工

secondary stress次应力；次重音

secondary porosity次生孔隙度

secondary data次级资料；二手数据；二级信息