For example, as the great ice sheets that covered North America during the last ice age steadily melted away, huge volumes of water flowed from them.

例如，随着覆盖北美的大冰原在最后一个冰河时代逐渐融化，大量的水从冰原流出。

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While 75% of our planet is covered with water, only about 2% is fresh water that comes from rivers, lakes, ice and snow.

虽然地球的75%被水覆盖，但只有大约2%是来自河流、湖泊、冰雪的淡水。

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Europa is covered in a shell of water ice that's thought to hide an ocean of liquid water below. Liquid water is a key ingredient for life as we know it.

木卫二由水冻冰层所覆盖，人们认为其下流动着大量的液态水，而正如人们所知，液态水是生命存在的重要因素。

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Freeze dates are defined as the observed period when a lake or river was completely ice-covered, and break-up dates as the last ice break-up seen before the summer open-water phase.

BBC: Ice records reveal warming trend