basic categories
... arrangement of categories 类型排列 basic categories 基层分类单元 between categories 分类之间 ...
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以国际土壤系统分类的基层单元的划分原理和方法，研究建立了成都平原的土系。
Using the taxonomy principles and methods of the basic units of World soil taxonomy, soil series in Chengdu Plain were divided.
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