refinements
Refinements are small changes or additions that you make to something in order to improve it. Refinement is the process of making refinements.
Older cars inevitably lack the latest safety refinements.
较老式的汽车难免缺乏最新的安全性能改进。
development and refinement of the game.
这款游戏的发展和完善。
Refinement is politeness and good manners.