对应的英语：
A triangle is a polygon with three edges and three vertices. It is one of the basic shapes in geometry. It makes the shape stable. We can see the shape everywhere:
The building structure, road warning, rules etc. I like triangle.
A triangle is a polygon with three edges and three vertices. It is one of the basic shapes in geometry. It makes the shape stable. We can see the shape everywhere:
The building structure, road warning, rules etc. I like triangle.
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