n.

1. 改進，改善；增進[U][C][（+in）]
   I cannot see any improvement in your writing.

   我看不出你在寫作方面有什麼改進。

2. 改進處，改善處[C]
   Painting the room yellow is a great improvement.

   把這房間漆成黃色確實好多了。

3. 改善的事物；勝過他人的人[C][（+on/over）]
   This composition is a great improvement on the one you wrote last week.

   這篇作文比你上星期寫的那篇進步了許多。

n.

▸a thing that improves something or is better than something else:

home improvements.