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 harmonic brake二次谐波制动secondary dendrite space二次枝晶间距secondary head exchanger二次热交换器secondary dacryoadenitis继发性泪腺炎secondary wind direction次级风向secondary reference fuel副标准燃料secondary electric clock子电钟secondary energy sources二次能源secondary school English初中英语secondary hypothyroidism继发性甲状腺功能减退