... 纯系选择 pure selection 纯系分离 pure separation 纯系说 pure theory ...
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pure line separation 纯系分离
pure breed separation 纯种分离
Pure strain separation 纯种分离
The third part mainly introduce the theory of pure separation of space.
第三部分，主要介绍了空间单纯剖分的理论。
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There are however few economically concentrated ores of the metals and their very similar chemical properties make the separation and isolation of individual REs in pure form difficult and expensive.
FORBES: Shortage Of Rare Earth Metals Exacerbated By Smuggling
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