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;
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;
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%；
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