烟草等级分类有很多标准，烟叶叶片结构是其中的标准之一。
There are many standards in tobacco grade classifying, and tobacco leaf structure is a important standard.
城市规模等级结构的划分是一个多指标的分类问题。
The division of city hierarchical structure is a multi-index classification problem.
城市规模等级结构的划分是一个多指标的分类问题。
The division of city hierarchical structure is a multi-index classification problem.
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