Road crews also maintain the road by plowing regularly, since open ice freezes more solidly than snow-covered ice.

道路人员同时也定时地做这种工作，因为这样的冰层比雪覆盖的冰层要更牢固。

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This water then freezes and thickens the ice road. Road crews also maintain the road by plowing regularly, since open ice freezes more solidly than snow-covered ice.

道路工人通过有规律的铲雪来维护路面，因为稀疏冰冻要比积雪冰冻更加坚固。

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Most of the Arctic is covered in snow and ice, which are highly reflective; if snow and ice melt, the exposed soil, which absorbs heat, serves to accelerate warming.

北极大部分地区被冰雪覆盖，具有很强的反射性；如果冰雪融化，裸露的土壤吸收热量，有助于加速变暖。

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He began to walk on the snow-covered ice.

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They could see the snow-covered mountains and huge amounts of blue ice.

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For example, the bright snow- and ice-covered landscapes of Canada and Siberia during winter reflect most solar radiation straight back into space, keeping the surface cold.

BBC: Earthshine map helps predict weather

According to the US National Snow and Ice Data Center (NSIDC), Arctic sea-ice covered 4.5 million sq km (1.7 million sq miles) at its lowest point on 12 September last year.

BBC: Arctic team targets key ice data

Drivers in Pennsylvania were traversing ice- and snow-covered streets and highways.

CNN: Storms snarl traffic, batter Midwest and Northeast