Height events have the necessity to reduce the trial jump frequency. This article puts forward special methods about reducing trial jumping f...
高度项目比赛有必要减少试跳次数，提出了减少试跳次数的具体办法。
Height events have the necessity to reduce the trial jump frequency. This article puts forward special methods about reducing trial jumping f...
高度项目比赛有必要减少试跳次数，提出了减少试跳次数的具体办法。
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