They found that some movements that happen over a specific amount of time now, were five times slower back then.

他们发现，在特定时间内发生的一些运动，在当时比现在慢五倍。

But removing that meltwater beneath the glaciers caused their ice to bottom out on rock again, slowed the ice back to its historical norms.

但是，清除冰川下方的融水导致它们的冰块再次触底反弹，使冰层缓慢恢复到曾经的水平。