sentence: People ski down the hill covered with snow while ski lifts pass above the hill. sentence:  A person ski on a small ramp, turn around but falls on the snow. sentence:  After, the person ski over the ramps and ski rails, and he lands stand on the snow. sentence:  Other people ski on ramps and on sky rails without falling. sentence:  A man ski over high rumps and on rails, also he jumps high and flips in the air.