- 問題詳情: Avalanches(雪崩)areoneofthosenaturaldisastersthatcancausegreatdamageandonlyMotherNatureknowswhenandwheretheyaregoingtooccur.Evenwithmoderntechnologyitisstillimpossibletoknowexactlywhenorwhereoneisgoingtooccur.Mountainclimbersarewisetobecare...
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