习惯用语be an improvement on1.比....好; 比....有改进be an improvement upon1.比....好; 比....有改进be an improvement over1.比....好; 比....有改进make an improvement1.改进特殊用法administrative improvement1.经营管理改善boiler improvement1.锅炉改造capital improvement1.设备改建constitutional improvement1.企业组织改善convergent improvement1.辐合改进fire control improvements1.防火设施forest tree improvement1.林木改良gradient improvement1.坡度的改善land improvement1.土地改良leasehold improvement1.租赁物改良local improvement1.局部改善octane improvement1.改善辛烷值; 改善爆炸稳定性operations improvement1.操作改进power-factor improvement1.功率因数改善price improvement1.提高价格; 提高有价证券行市profit improvement1.营利改进technical improvement of agriculture1.农业技术改造yield improvement1.提高耕地产量improvement of breed1.结构改进, 品种改进improvement of business operations1.经营的改善improvement of contaminated soil1.污染土壤的改良improvement of convergence1.收敛性的改善improvement of terms1.条件改善improvementof visibility1.能见度的改善