According to the theory of forestry health, the forestry health in Qilian Mountain is affected by mice pest, snow break, landslide, drought and unreasonal forestry stand structure and so on.
应用森林健康理论，分析得出威胁祁连山森林健康的主要自然灾害为病虫鼠害、雪折、风倒滑坡、气候干旱及森林组成和林分结构不合理；
The wetter snow associated with warmer temperatures in recent years causes a frozen crust to form over the plants, which the reindeer can't break through.
最近几年，与较高温度相关较湿的雪地导致了在这些植物上面形成一层冷冻外壳，而驯鹿却无法打破这层外壳。
Icebergs are large pieces of freshwater ice that break off snow-formed ice shelves or glaciers and float in open water.
冰山是由雪形成的冰架或冰川断裂而成，主要由淡水冰组成，一般漂浮在开阔海域。
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