The Ice Bucket Challenge requires that participants pour a bucket of ice water on themselves.

冰桶挑战要求参与者将一桶冰水倒在自己身上。

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A closed system would be, for instance, a glass of ice water with an ice cube in it, with the lid on top.

一个封闭系统可以是，比如说，一杯放了一个冰块的冰水，顶上加了盖子。

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Unlike floating ice shelves which have little impact on sea level when they break up, the ice sheet is anchored to bedrock will blow the sea surface.

当浮动冰架破裂时，对海平面的影响很小；而与之不同的是，固定在基岩上的冰盖将会使海面炸毁。

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Bob Doughty and Faith Lapidus tell about some of the winning American athletes on and off the ice and snow.

VOA: special.2010.02.26

Some children bring all the tools they are on and one of the boys share he wants to bring a ice cream machine.

一些孩子画上了他们喜欢的所有工具,其中一个男孩,告诉大家他想带一台冰激凌机。

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And it's dangerous. People slip and fall on the snow because it's made of ice.

这样也很危险，人们会在雪上滑倒，因为雪里面都是冰。

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An army of snowploughs and maintenance engineers work 24 hours a day to ensure the ice is in tip top shape while the NCC's Ice Safety Committee monitors the ice on an hourly basis.

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And given that the krill (tiny crustaceans) that penguins feed on are also dependent on the ice for their own existence (they feed on algae on the ice) - some colonies affected by eroded floes could face a double-whammy of high fledgling mortality and restricted food resources.

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"He managed to get his front paws on the ice and I pushed his back end up so he was on the ice, then I used the leash and him to kind of pull myself up onto the ice, " Shaw said.

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