addition key加法键additionn.增加；加法；附加物additional gas IC reactor附加气IC反应器Additional bending moment附加弯矩additional polymerization[化] 加成聚合additional damping signal附加阻尼信号addition and modification增层改造addition way of solid fuel燃料加入方式additional measuring pilot辅助测试导频addition of optical fields光学场叠加additional carding eiement附加分梳件additional demagnetization附加去磁