Đâu là sự khác biệt giữa improve và improve on ?Hãy thoải mái đưa ra các câu ví dụ nhé.

improve ~ = take something and make it better
improve on ~ = using something as a guide, make something new that is better than it

The engineers improved the design of the car's engine. (= they took an existing design and made it a little better)
The engineers improved on the design of the car's engine. (= they looked at an existing engine and made a new one that is better)

We need to improve this year's sales numbers. (= we need to make those numbers better)
We need to improve on last year's sales numbers. (= we need to look at last year's numbers and do better than that)