剩余的积雪能够让雪集成堆，且由于多年的积雪形成的压力，剩余的积雪能够让掩埋的雪变成冰川冰，这些冰川冰的厚度足以使冰块流动。
A surplus allows snow to accumulate and for the pressure of snow accumulated over the years to transform buried snow into glacial ice with a depth great enough for the ice to flow.
该研究的作者说，由于变暖，冰流动更加流畅，因此，变暖的气候可使冰层上冰块流动速度比以前想象的要快得多。
Ice flows more readily as it warms, so a warming climate can increase ice flows on ice sheets much faster than previously thought, said the study authors.
这张由宇航员拍摄的照片展示了两个主要的山谷冰川：几处缓慢流动的巨大冰块和被冰川夹带着沿坡而下的碎屑，勾勒出广阔的山谷景观。
This astronaut photo shows two major valley glaciers: large masses of slowly flowing ice and entrained debris that move downhill, carving out wide valleys.
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