dihedral group

例句：

1. 1. The dihedral group is a type of crystal structure that has a unique shape.
   双锥体群是一种具有独特形状的晶体结构。
2. 2.The dihedral group was discovered by a team of scientists who were working on a new material.
   一个科学家团队发现了双锥体群，他们正在研究一种新材料。
3. 3.The dihedral group is used in various applications such as optics and electronics.
   双锥体群在光学和电子学等领域有广泛的应用。