你怎样能确定你的立体图形旋转以后还是不同的？
How can you make sure that your cuboids are not the same if rotated?
它们还可用于图形工作，如简化gui上对象的旋转。
They can also be used for graphics work, such as simplifying the rotation of objects on a GUI.
这样，当我在旋转图形时，直线的中心将发生旋转。
That way, when I rotate the shape, the rotation occurs from the center of the line.
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