Precipitation is a regionalized variable changing with the variation of space position. It has both random and structural properties.
降雨量系随空间位置变化的一种区域化变量，既有随机性，又有一定的结构性。
The grey value of image can be treated as regionalized variable, which has the property of both random and spatial structure distribution.
图像的灰度值可以看作是一区域化变量，不仅具有随机性，而且具有空间结构性。
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