中国西北地区降水总体偏少，但没有明显的变化趋势。
For the west of Northwest China, analysis suggests that precipitation decreased a little, but with no obvious variation trend.
我国西北地区降水稀少，蒸发强烈，水资源贫乏，是矿产资源富饶的缺水贫困区。
The arid northwest China is an undeveloped area in economy, being rich in mineral resources but shortage in water resources due to sparse rainfall and intense evaporation.
结果表明： 近五十年来， 中国西北地区降水以强降水为主， 较强以上强度降水占总降水日数的5%， 但其降水量占总降水量75%；
In recent 50 years in Northwest China, the total rainfall is mainly contributed by the stronger rain, which contributes 75% rainfall in 5% rainfall days;
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