secondary low次生低压,副气旋,副低压secondaryadj.次要的；从属的；中等教育的n.副手；次要位置secondary screwworm fly副旋皮蝇Secondary thyroidectomy甲状腺二期切除术Secondary Health Schoolsecondary optic vesicle次级视泡Secondary Alarm Station辅助报警站secondary water cooling二冷水secondary butyl acetate乙酸仲丁酯secondary branchial bar次级鳃条secondary embryogenesis次生体胚发生secondary pressure drop二次压降