pentalpha

例句：

1. 1. The shape of the pentagon is unique and fascinating.
   这个五边形的形状独特且引人入胜。
2. 2.The pentagon was used in ancient architecture as a symbol of balance.
   在古代建筑中，五边形被用作平衡的象征。
3. 3.The pentagon has five sides, each with an angle of 108 degrees.
   五边形有五个面，每个面的角都是108度。