赋税是按收入划分等级的。
怎样对供应商进行评定和划分等级？
屋顶相互连接，并按照方向和功能划分等级。
The roofs are connected and have grade in accordance with direction and function.
划分，区分，分等级根据能力或地位对人进行分类。
Categorization of a group of people according to ability or status.
划分，区分，分等级根据能力或地位对人进行分类。
Categorization of a group of people according to ability or status.
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