simple extension

例句：

1. 1. The company's simple extension of its product line has been well-received by customers.
   该公司对产品线的简单扩展受到了客户的热烈欢迎。
2. 2. The engineer proposed a simple extension to the design to improve efficiency.
   工程师提出了对设计的一个简单扩展，以提高效率。
3. 3. The new software offers a simple extension of existing features without requiring additional programming.
   新软件提供了现有功能的简单扩展，无需额外编程。