可改善

例句：

1. 1. The company's profits have improved significantly since the new policy was implemented.
   自从实施了新政策后，公司的盈利显著提高。
2. 2. The teacher noticed that the students' grades had improved after the extra help he provided.
   老师注意到，在提供额外帮助后，学生们的成绩有所提高。
3. 3. The project team has been working hard to improve the efficiency of their processes.
   项目团队一直在努力提高他们流程的效率。