extension axiom

例句：

1. 1. Thecompany's product line has been extendedto include new models.
   该公司的产品线已经扩展到包括新的型号。
2. 2. The team is workingon an extension of the project.
   团队正在努力推进项目的扩展。
3. 3. The researcher proposedan extension of the theory.
   研究者提出了理论的扩展。