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It's a example of 2d coordinate frame. It's very similar in 3d frame.
上面是2维坐标系中的例子，同样，对于3维的也一样。
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The characteristics of a Chinese modern geocentric 3D coordinate frame;
中国地心3维坐标框架应具有的特点；
youdao
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The characteristics of a Chinese modern geocentric 3D coordinate frame;
中国地心3维坐标框架应具有的特点；
youdao