青云翻译

In order to verify the relative position of these pairs region, we use four areas constitute the quadrilateral, as shown:

In order to verify that the relative position of the region, we use four form the area of quadrilateral, as figure:

In order to confirm these pair region the relative position, we use four constitution quadrangle the region, like chart:

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In order to verify that the relative position of the region, we use four form the area of quadrilateral, as figure: