油污使水面变得平滑，让它更接近于一面镜子：更多的入射日光被反射回处于同一角度的观测器（卫星）。
Oil smoothes the water surface, making it a better mirror: more sunlight is reflected back to the observer (the satellite) at the same angle as the incoming sunlight (right).
当对板面的平滑度，光洁度要求较高，在装饰之前可先对板面进行全面抹灰，再用打磨机砂光，然后进行涂饰面处理。
There is a strict requirement toward the smoothness of the plate surface. Before decoration process begins, the board should be sanded with sanding machine and then grinded completely.
齿面经过脉冲电化学光整加工后表面粗糙度低、微观几何形貌平滑，不仅使齿轮寿命大幅度提高而且工作噪音也大幅度降低。
The lower surface roughness and smooth microform by electrochemical finishing not only enhance highly the life of gear, but reduce the noise.
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