To establish such a chronology, it is necessary to determine the relative amounts of land ice that existed at various times in the Earth's past.

为了建立这样一个年表，有必要确定地球过去不同时期存在的陆冰的相对数量。

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Such feedbacks might involve ice on land and sea, clouds, or water vapor, which also absorb radiant heat.

这种反馈可能涉及陆地和海洋上的冰、云或水蒸气，这些也会吸收辐射热。

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The North Pole has no land, only thick ice.

北极没有陆地，只有厚厚的冰层。

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Science tells us that a large body of ice moved across the land.

VOA: special.2009.01.05

Cryosat-2 will measure very precisely the rates of change of sea and land ice in the Arctic and the Antarctic.

BBC: Launch success for Esa's Cryosat-2 ice mission

The Arctic's vulnerability is exacerbated by increasing flows of freshwater from rivers and melting land ice, as freshwater is less effective at chemically neutralising the acidifying effects of CO2.

BBC: Arctic Ocean 'acidifying rapidly'

They are a hockey team in a land without snow or even ice.

CNN: L.A. Kings lose to Devils, must wait for first Stanley Cup