跳高和撑竿跳高比赛时,有的运动员为何有时不跳?周洋在田径运动会上，往往参赛运动员的水平相差较大，如跳高比赛时，有的运动员跳过１．９０米不费力，而有的最高只能跳过１．６０米；撑竿跳高运动员有的跳过３米就已经很吃力了，但有的人却轻而易举地越过４米的高度，所... Why do some athletes do not sometimes skip when jumping and pole vaulting? Zhou Yang often has a big difference in athletics athletes. For example, some athletes skip 1.90 meters at effortlessly Some of the highest can only skip 1.60 m; Pole vault skip some 3 meters have been very difficult, but some people easily over 4 meters height ...