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。
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.
借用鲍勃·迪伦的话，哪怕你不是冰河学家，也能知道融化了的冰会往哪里漂浮。
But to 5 paraphrase Bob Dylan, you don't need a glaciologist to know which way the ice flows.
冰河学家对木卫二进行了多年的研究，试图搞清为什么它的表面伤痕累累，裂纹丛生。
Glaciologists have been studying the surface of Europa for many years, trying to work out what formed its scarred, fractured surface.
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