改良物

例句：

1. 1. The company has introduced severalnew products to improve the quality of itsexisting ones.
   该公司已经推出了几款新产品来提高现有产品的质量。
2. 2. The engineer designed a moreefficient machine to improve production efficiency.
   工程师设计了一台更高效的机器以提高生产效率。
3. 3. The governmentis working on developing new technologies to improvethe living standards of its citizens.
   政府正在努力开发新技术以提高公民的生活水平。