So its very smooth very flat ice and you push a sledge on it and then you let go, what happens? The sledge keeps going. How can that be?
冰面很光滑，你推动雪橇，然后放手，接下来会怎样呢，雪橇仍然会继续前进，为什么会这样呢？
Smooth ice provides very little resistance against objects, like ice skates, being dragged across its surface.
光滑的冰面对于物体——譬如在冰面上拖曳的冰刀——施加极小的摩擦阻力。
The route overhangs an ancient riverbed, so its very cozy, nice smooth rocks, open space, river, field, everything nice all at once!
路线悬挂于一条古河道之上，四周惬意幽静，岩壁光洁，空间宽敞，河流，田野，瞬间一切都变得那么美妙！
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