secondary ore次生矿secondaryadj.次要的；从属的；中等教育的n.副手；次要位置secondary air cooling二冷气secondary focal point次焦点secondary type glider中级滑翔机secondary time effect次时间效应secondary decollement次一级滑脱构造secondary light waves次光波secondary metabolitos次生代谢物secondary constrition次缢痕Secondary drive ratio二次传动化secondary ventilation辅助通风,局部通风