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The species-group rank below species 在种之下的种群层级
AHP method with progressive rank structure was applied in the paper to study on the optimum structures of forest type and tree species in Qiuqiangou forest Farm, Shanxi Province.
选用层次结构的层次分析法作为数学工具，对山西省秋千沟林场的林种和树种结构进行了研究。
A scientific name of a taxon at the rank of species.
即一个种级分类单元的学名。
Here "4 years" means the basic time, "4 ranks" refers to the rank level, "6 species" refers to the classification of tutors.
这里“4年”指的是基础时间，“4级”指的是职称级别，“6类”指的是辅导员分类类别。
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