improved paper

例句：

1. 1.The new printer uses improved paper that is more eco-friendly.
   新打印机使用更环保的改良纸张。
2. 2.The company has invested in improving the quality of its paper products.
   该公司投资于提高其纸制品的质量。
3. 3. The old printing press used inferior paper, which was difficult to read.
   旧印刷机使用的纸张质量差，难以阅读。