improvement
/ɪmˈpruːvmənt/noun
1- an example or instance of improving or being improved进步（或改善、增进）的实例：
an improvement in East-West relations.
东西方关系改善的实例。
1.1
- mass noun the action of improving or being improved进步, 改善, 增进：
there's still room for improvement.
还有改进的余地。
1.2
- a thing that makes something better or is better than something else帮助改善之物：
home improvements
家居改善物品
it's an improvement on the last cake I made.
这比我上次做的蛋糕好多了。
词源
late Middle English emprowement （in the sense 'profitable management or use; profit'）， from Anglo-Norman French， from emprower （see IMPROVE）.