regular octahedron

例句：

1. 1. The schedule is very regular.
   这个时间表非常规律。
2. 2. He follows a regular dietto maintain his health.
   他遵循规律的饮食来保持健康。
3. 3. The work is done regularly, ensuring quality every time.
   工作是定期完成的，确保每次都有质量。