secondary end次级端secondaryadj.次要的；从属的；中等教育的n.副手；次要位置secondary infertility次因性不孕secondary marshalling辅助编组secondary dump system辅助转储系统secondary yolk nuclei次生卵黄核secondary transaction次级交易secondary orientation从属定向secondary dislocation二次位错secondary idle-hole怠速副喷口secondary interstices次性间隙secondary preselector第二预选器