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为什么雪崩救援要争分夺秒？
雪崩救援要争分夺秒主要是因为雪崩后幸存时间短、低温环境威胁生命、以及搜救难度随时间增加而加大。
1、雪崩后幸存时间短。据统计，雪崩发生后的前15分钟是救援的黄金时间，超过这个时间，幸存率会急剧下降，被埋人员生还的可能性每分钟都在减少。
2、低温环境威胁生命。雪崩通常发生在寒冷的高山环境，被埋人员极易受到低温的伤害，导致体温迅速下降，可能引发低温症甚至死亡。
3、搜救难度随时间增加而加大。随着时间的推移，被埋人员的位置可能因积雪的移动而发生变化，积雪也会逐渐固化，增加搜救的难度和风险。
总结：雪崩救援要争分夺秒，是因为雪崩后幸存时间短、低温环境威胁生命以及搜救难度随时间增加而加大。
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