Solution: According to the definition of the space rectangular coordinate system, the coordinate of the point on the straight line passing through point and parallel to axis is , that is, the first two coordinates are the same as the coordinates of , and the third coordinate is replaced by the flow coordinate 

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The coordinates of a point on the plane parallel to the plane passing through point are

That is, it is the same as the third coordinate of point , and its first two coordinates should be changed to flow coordinates

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