tetranap

例句：

1. 1. The square has a lot of people gathered around it.
   那个正方形周围聚集了很多人。
2. 2. The rectangle is the shape of a book cover.
   这个矩形是书封面的形状。
3. 3. The square and rectangle are two basic shapes in mathematics.
   正方形和矩形是数学中的两种基本形状。