improvern.改良者；改善者；改进剂improvevt.改善；改进；提高vi.变得更好；改进improve the levels提高层次improved MC method改进的MC算法Improved ADC model改进ADCimproved SIR model改进的SIR模型improved tolerance修正容限Improved varieties良种improved craftwork工艺改进improved operation改良手术improved structure改进结构Improved Mine Fuze改进的地雷引信