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从奥运会的百年历史来看,历届奥运会面临着诸多风险因素,共有三届奥运会取消;一届易址举办;四届奥运会遭到大规模抵制;两届奥运会遭到直接的恐怖袭击……北京奥运会已未雨绸缪。
From the Olympic history of a century, the Olympic Games is facing many risk factors, a total of three Olympic Games canceled; the first site was held; four Olympic Games was a massive boycott; two Olympic Games was a direct terrorist attack ... Beijing Olympic Games Has taken precautions.