2-dimensional plane modol 平面二雉模型
A key limitation of the picture shown here is that we can only portray the curvature of a 2-dimensional plane of an actual 3-dimensional space!
这里给出的图片局限性在于，我们只能通过一个二维图片来表现三维空间！
Map projection in cartography is a way to present a two-dimensional curved surface on a plane, such as a normal map. Figure 2 shows a Traverse Mercator projection.
绘图法中的地图投影方法可以在平面中表示一个两维的曲面，例如一个标准地图。
This gives a three dimensional model which is then projected onto one plane to give a 2 dimensional graphic (See figure 3a).
这给出了一个三维模型，然后到一个飞机预计将提供一个二维图形（参见图3a）。
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