“改善”在英语中叫做“improve”。
We need to prevent contamination in our factory.Do you have any good ideas?
我们希望防止工厂污染，有什么好办法吗？
Hmm, why don't we try introducing static eliminators?
这样啊，导入静电消除器怎么样？
That sounds like a good idea. Ok, can you run some tests and see how much it can improve the cleanness?
听起来不错。OK，能帮我测试一下可以改善多少清洁度吗？
All right, I'll get right on it.
明白了。我立刻去处理。
When you're finished please give me some feedback on the results.
结果出来后请告知我。
使用improve的表达还有“improve efficiency（提升效率）”、“improve productivity（提升生产效率）”等。