secondary era中生代secondaryadj.次要的；从属的；中等教育的n.副手；次要位置secondary water-cooling二冷水secondary fuel oil filter燃油精滤器secondary macular atrophy继发性斑状萎缩secondary network support辅助网络支援secondary seedling family次生代实生有性系secondary cooling control二冷控制Secondary Strike Capacity二次打击能力secondary weather station辅助气象台secondary podzolized soil次生灰化土secondary auditory cortex次级听皮层