- graded tariff
- 税率: tax rate; rate of taxation; ...
- 级差: gradation; stage head
- 税率: tax rate; rate of taxation; tariff rate; tax ratio◇税率等级 grades of tax rates
- 等级差: [数学] rank difference◇等级差平方相关 [数学] rank difference square correlation
- 灰级差: grey level difference
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