焦面：光线经过镜头后形成清晰影象的平面。
Focal plane: The plane where light entering a lens forms a sharp image.
苗床整平后，用铁锹拍平，浇上10%腐熟稀人粪尿，再住床面亡铺一层过筛的焦泥灰或黄泥土，厚度约5厘米即可。
Seedbed leveling, Yongtieqiao shoot-ping, doused with 10% who maturity dilute waste, then living death bed screening of a shop Coke Nihui or yellow soil to a thickness of about 5 cm can be.
线长变化后，焦线宽度、光强分布均匀性、靶面位置仍然不变。
After the line length varied, the width, intensity distribution along the line length, and the target position are still unchanged.
线长变化后，焦线宽度、光强分布均匀性、靶面位置仍然不变。
After the line length varied, the width, intensity distribution along the line length, and the target position are still unchanged.
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