secondary cut多次切割secondaryadj.次要的；从属的；中等教育的n.副手；次要位置secondary ossification center继发骨化点secondary manganous phosphate二代磷酸锰Secondary syphilis of viscera内脏二期梅毒secondary stress-baring area应力副承托区secondary grounding of b phase二次b相接地secondary generalized epilepsy继发性全身性癫痫Secondary hydrodesulfurization二段加氢脱硫secondary recording instrument辅助记录仪表secondary circuit voltage drop二次回路压降secondary air injection system二次空气喷射系统