就像你看到的，照片工作室的地面有点脏，所以为了移除污渍，我使用了一些表面模糊。
As you can see the background of the photo studio was kind of dirty, so in order to remove the stains I applied some Surface Blur.
仍然保持选区所在，点击Ctrl + j来复制选区到一个新图层，然后在新的图层中设置表面模糊(滤镜模糊表面模糊)，参数如下。
Maintain the selection, hit Ctrl + J to make a layer via Copy and apply following Surface Blur Settings to this layer.
玻璃蒙上水雾模糊不清是因为温度和湿度较高的气体接触冷表面便会骤然冷凝。
Glass mists up because of sudden condensation when warm, humid air comes into contact with a cold surface.
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