下雪是降水的一种形式，气象上称之为固体降水。
Snowing is a kind of form which declines water and call it as on the weather the solid declines water.
北京北部山区的泥石流是降水、地貌、地质构造与固体堆积物及人类活动等因素长期共同作用的结果。
The factors caused debris flow in Northern Mountain of Beijing in 1991 were the precipitation, geomorphology, geologic structure, solid accumulation and the human activity.
特殊的地理位置，复杂的地质构造，丰富的松散固体物质，陡峭的地形加上降水集中的气候，为泥石流的发生创造了客观条件。
Special geography setting, complex geology structure, abundant loose materials, steep landform and frequent precipitation are the necessary conditions for debris flow occurring.
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