They do that by skiing really fast s gold medal skier skiing in front of him saying jump, turn right, so forth.

以非常快的速度滑雪,世界冠军在他前面滑着，and，having，the，world’,不停地发出，起跳，右转，等口令。

斯坦福公开课 - 7个颠覆你思想的演讲课程节选

Glasses and goggles will help you find open space fast when you are sky-diving, or let you know the hang time of your last jump if you happen to be skiing.

FORBES: Why Sensors Are a Force of Context

Eric Remjeske, 38, was skiing in Vail this February when he made the mistake of flying off a jump too slowly.

FORBES: Magazine Article