| http://www.w3.org/ns/prov#value | - The Z-axis positive direction is defined by the direction of propagation of light rays incident on an optical system, a plane including the Z-axis and the center of the image plane is defined as the Y-Z plane, and the direction passing through the origin, intersecting at right angles with the Y-Z plane and going down through the paper is defined as the X-axis positive direction.
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