addition key加法键additionn.增加；加法；附加物additional reinforcement附加钢筋additional fertilization追肥addition and subtraction加减法additional consideration[法] 补偿, 额外报酬additional setting wheel附加拔针轮additional air regulator补给空气量调节器additional control point辅助控制点additional building bulk容积奖励additional layer of flet辅助油毡层additional vulcanization后硫化