improvements
If there is an improvement in something, it becomes better. If you make improvements to something, you make it better.
the dramatic improvements in organ transplantation in recent years.
近几年器官移植上取得的巨大进步。
There is considerable room for improvement in state facilities for treating the mentally handicapped.
为治疗智障患者所设的公立设施还有很大的改善空间。
If you say that something is an improvement on a previous thing or situation, you mean that it is better than that thing.
The new governor is an improvement on his predecessor.
新任总督胜过他的前任。