extension service

例句：

1. 1. Our company offers an extensive range of products to meet the needs of our customers.
   我们公司提供广泛的产品，以满足客户的需求。
2. 2.The government has introduced a new extension service for senior citizens to improve their quality of life.
   政府为老年人推出了一项新的扩展服务，以提高他们的生活质量。
3. 3. The library provides free extension services such as online research and tutoring for students.
   图书馆提供免费扩展服务，如在线研究和辅导学生。