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梯形胸怀宽广,因为三角形,扇形,圆,圆环,扇环都可以为梯形容纳,你信吗?该一读本文,不由得你不信,
Trapezium has a broad mind, because triangles, scallops, circles, rings, and rings can all be trapezoidal. Do you believe that? When you read this article, you cannot help but believe.