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- 正方形是二维的（平面的），而正六面体则是三维的（立体的）。
A square is two-dimensional and a cube is three-dimensional.
- 正方形有四个角儿;立方体有八个角儿。
A square has four corners; a cube has eight.
- 小女孩在纸上画了一个正方形。
The little girl drew a square on the paper.
- 正方形有四条边，而圆形没有边。
A square has four sides but a circle has no sides.
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