这些读数显示了冰层隆起有多厚，相互间倾斜角度有多大，从而提供了底层冰盖的形状。

The readings show how thin layers of ice bulge and tilt in relation to each other, which offers clues to the shape of the underlying ice sheet.

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图片是过去十年间由美国间谍卫星拍摄的，它们证实了，在最近几年，大面积高纬度区域在夏天失去了冰层的覆盖。

The photographs, taken by spy satellites over the past decade, confirm that in recent years vast areas in high latitudes have lost their ice cover in summer months.

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这项报告预测北极海洋在30或40年间有可能会在夏季的那几个月里变成没有冰层覆盖的海面。

The report forecasts that the Arctic Ocean, within three or four decades, will likely become nearly ice free during the summer months.

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