... hold just over 2% of all the earth’s water 包含地球上超过2%的水 the polar ice sheets 极地的冰片 live on the North Pole 居住在北极 ...
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The last expansion of the polar ice sheets took place about 18,000 years ago.
最后一次扩大发生在一万八千年前。
They understand that the greatest and least predictable effect will be the melting of the polar-ice sheets and the consequent rise in sea level.
他们也明白，最大和最不可预测的影响将是极地冰盖融化和随之而来的海平面上升。
The melting of glaciers, ice caps and polar ice sheets on land, however, has the potential to account for much more.
然而，陆地上的冰川、冰盖和极地冰盾的融化有更大的潜在力量。
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