improving environmental sanitation

例句：

1. 1. The companyis improving its efficiency in the new year.
   公司在新年里正在提高其效率。
2. 2. Theteacher is improving her students' gradesby providing additional support.
   老师通过提供额外的支持来提高学生的分数。
3. 3. Theeconomy is improving, andpeople are feeling more hopeful aboutthe future.
   经济正在改善，人们对未来感到更加乐观。