使角α的顶点与原点重合，始边与X轴正半轴重合，终边落在第几象限，则称角α为第几象限角，终边落在坐标轴上的角α被称为轴线角。
从轴线角度认识草书章法，对继承草书传统和推进当代草书创作有着重要的意义。
It is of great significance to know cursive art of composition from the axis Angle for the succession of traditional cursive and the promotion of contemporary cursive creation.
在没有观测到侧壁的前提下，其轴向反射率最大，随着偏离轴线角度的增加，反射率逐渐减小。
Without observing the inner side of the practical blackbody, the axial reflectivity is maximum, and the reflectivity decreases as the angle that departs from axis increases.
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