secondary row辅助行
secondaryadj.次要的;从属的;中等教育的n.副手;次要位置
secondary brain vesicle次级脑泡, 二级脑泡
secondary triangulation二等三角测量
secondary reinforcement次级强化
secondary settling tank二次沉淀池
secondary heart disease继发性心脏病
secondary building unit次级结构单元
secondary spermatocytes次级精母细胞
secondary water-suply二次供水
secondary clarification二次澄清
secondary building edge二次界面