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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They found fossils of microscopic marine plants which suggest that the region was once open ocean, not solid ice.

他们发现了微型海洋植物的化石，表明该地区曾经是开放的海洋，而不是坚固的冰层。

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Intrigued, he and Grace decided to open two ice cream shops shortly after graduation.

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Powers asks him to open up the ice trays.

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Dyfed-Powys Police said all roads were open, but black ice caused more than a dozen accidents on the A40 between Carmarthen and St Clears.

BBC: Warnings about ice on Welsh roads were issued