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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Short-Term Probabilistic Forecasts of Ceiling and Visibility Utilizing High-Density Surface Weather Observations.

用高密度地面天气观测进行飞行高度和能见度短期概率预报。

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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