但金星始终为浓云密雾所笼罩，仿佛一层厚厚的面纱，使人类难以窥视到它的真面目。
However, Venus is all the time enveloped in thick clouds and mists, as if they are a layer of very thick veil, which renders it very hard for human beings to have a peep at its true features.
对于海上钻探，北极的水域特别危险，因为极端寒冷，长时间的黑暗，密雾，以及飓风强度的大风。
The waters of the Arctic are particularly perilous for drilling because of the extreme cold, long periods of darkness, dense fogs and hurricane-strength winds.
指定水下的雾看上去有多密。
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