Change of underground water level dynamic tendency for more than one year may be anomalous one, when there is no increasing or decreasing in water quantity.
在无其他因素引起水量增、减条件下，地下水动态大于一年的趋势变化是地下水动态的异常变化。
The dynamic changes are distinguished from the change quantity, mode, intensity, structure and trend.
土地利用动态变化在数量，方式，强度，结构和趋势等方面存在很大的差异。
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