... 纯系说 pure line theory 纯粹群集 pure vegetation;pure community 纯营养系 pure-clonic form ...
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Widespread distributed pure carbonate rock is the basis on which stony desertification formed while relief and vegetation retrogression process can also promote desertification.
广泛分布的纯碳酸岩是形成石漠化的基础，地貌植被退化过程也可促进石漠化。
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