扩展面光源如太阳光与激光光源有明显的差异，因此它们照射到随机粗糙柱面后的散射特性也不同。
Because of obvious difference between expanding light source and laser source, it appears different scattering peculiarity while they project to a random rough cylinder.
从二维平面曲线的定义出发，进而扩展至三维空间柱面的定义。
The definition of spatial cylindrical surfaces is extended, amplifying on the definition of corresponding planar curves.
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