an important step in varietal improvement

例句：

1. 1.The company's performance has significantly improvedsince the new manager took over.
   自从新经理上任以来，公司的绩效有了很大的提高。
2. 2. The teacher suggested that we should improveour reading skills by reading more books.
   老师建议我们通过多读书来提高我们的阅读技能。
3. 3. The economy is improving, andpeople are starting to spend more freely.
   经济正在改善，人们开始更加自由地消费了。