To define the visibility of the edges, you can apply a Edit Mesh modifier to the object, change to the edge sub-object level and use the Surface Properties tools.

要定义边缘的可见性，您能运用编辑滤网修饰词于对象，变成边缘次级对象水平并且使用表面物产工具。

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A thick cloud of water droplets suspended in the atmosphere at or near the earth's surface that obscures or restricts visibility (strictly, reducing visibility to below 1 km).

云层中的水滴悬浮在空气中或者接近地表，使能见度变低（严格地说，使能见度变得不足1千米）。

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There is no simple one-to-one correspondence between optical depth and surface horizontal visibility.

光学厚度与地面水平能见度不呈简单的对应关系。

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"The warmth of the water and the visibility is incredible, so you can see the whole ship from the surface, " says Easterbrook.

CNN: A worthy wreck for divers: USS Kittiwake

Even when the sharks are found closer to the ocean surface, they spend their time in the cool-temperature, plankton-rich waters that limit underwater visibility and make diving difficult.

CNN: Scientists discover winter home of world's second-biggest fish