Boring machines weighing up to 1,300 tons drilled at nearly 3.5 meters per hour.

重达 1,300 吨的钻孔机以每小时近 3. 5 米的速度钻孔。

But some glaciers can suddenly shift gears, flowing many meters per hour before slowing down, often for weeks or months.

但是一些冰川可以突然换档，在减速之前每小时流动数米，通常持续数周或数月。

When two kinds of air try to pass each other, they get locked together, and the hot air spirals upward more and more quickly until it may be whirling round at between 400 and 500 meters per hour.

当两种空气试图互相通过时，它们会被锁在一起，热空气会越来越快地螺旋上升，直到它以每小时400到500米的速度旋转。