According to Straneo, the rapid changes to the ice sheet have taken glaciologists by surprise.
据斯特拉内奥说，冰盖的迅速变化令冰川学家措手不及。
Many glaciologists believe that within a few decades, the Greenland ice sheet may reach a point of no return, after which its near-total meltdown becomes inevitable.
许多冰川学家认为，在几十年内，格陵兰冰盖也许会达到无可挽回的顶点，之后，它不可避免地将几乎完全融化。
Why the ice periodically advances - and why it retreats again - is a mystery that glaciologists have only just started to unravel. Here's our recap of all the back and forth they're trying to explain.
为什么冰层会周期性地推进，为什么又会消退，这还是个谜，冰河学家们正试图揭开谜底。
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