a. made more desirable or valuable or profitable; especially made ready for use or marketing
s. become or made better in quality
s. (of land) made ready for development or agriculture by clearing of trees and brush
a. 改良的
1. The new system has improved our efficiency at work.
新系统提高了我们的工作效率。
2. She has improved her English skills over the past year.
她在过去的一年里提高了她的英语技能。
3. The quality of the product has improved since the last version.
自上一个版本以来，产品的质量有所提高。