求翻译：to its initial value, while, 50 m away from the well, the permeability is unchanged. In between, the permeability decreases with是什么意思？

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悬赏分：1 - 离问题结束还有

to its initial value, while, 50 m away from the well, the permeability is unchanged. In between, the permeability decreases with

问题补充：

匿名	2013-05-23 12:21:38

匿名	2013-05-23 12:23:18

匿名	2013-05-23 12:24:58

匿名	2013-05-23 12:26:38

匿名	2013-05-23 12:28:18

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