secondary tin再生锡secondaryadj.次要的；从属的；中等教育的n.副手；次要位置secondary air flow第二股气流secondary thrombus[医] 继发血栓secondary stimulus再刺激secondary epilepsy继发性癫痫secondary fumarole次生喷气孔secondary focusing次级聚焦secondary abutment次桥基secondary material二次材料secondary evidence间接证据Secondary Hospital