Then the theatre was dark. There was the jerking flicker of a reel starting and stopping, conglomerate unhuman figures and motion, whistles from the audience.
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
Brake: Device for decreasing the speed of a Body or stopping its motion.