1.改進      v.

She put forward a plan for improving the speed of production.

她提出一個改進生產速度的計畫。

2.利用 v.

He always improved his leisure by learning foreign languages.

他總是利用閒暇時間學習外語。

3.改善 v.

The newspaper said that our working conditions have been improving since last year.

報紙上說，自去年以來我們的工作條件一直在改善中。