Well, the ground just pushes right back, supplying a force forward and up that propels the skaters into a glide or jump, depending on the particulars of the force they applied.
The general low level of friction on ice allows a skater to glide along the surface smoothly without friction stopping the motion as soon as it's begun.
冰面上摩擦力通常较低，这使得滑冰选手一俟启动，就能不受摩擦力牵绊，顺畅滑翔冰面。
3
Once he was over the hump of the hill, he let the cycle glide. He slowed down on Rose Lane, found the house number, which he had memorized, and rang the bell.