retrofixatio

例句：

1. 1. The retrofitting of the old building has greatly improved its energy efficiency.
   对旧建筑的改造大大提高了其能源效率。
2. 2.The scientist's research on retrofitting technology has made significant contributions to the field.
   这位科学家在改进技术方面的研究为该领域做出了重大贡献。
3. 3.The company is retrofitting its fleet with newer models to improve fuel efficiency.
   该公司正在为其车队更换新款模型，以提高燃油效率。