improvement of soil fertility

例句：

1. 1. The company's product qualityhas significantly improved since the new manager tookover.
   自从新经理上任以来，公司的产品质量有了很大的提高。
2. 2. The teacher emphasizedthe importance of continuous improvement in his lecture.
   老师在讲座中强调了持续改进的重要性。
3. 3. The team worked hard to improve theirperformance and achieve better results.
   团队努力工作以提高他们的性能并取得更好的结果。