定级的英文：
classification
(The gradation and classification of agricultural land in China)
11、中国农用地分等定级
n. 分类；等级
This kind of classification is not exhaustive.
这种分类法并不是包罗无遗的。
To determine the taxonomic classification of(an organism.
确定(有机体的)类别等级
They defy accurate classification at present.
这使目前的正确分类有困难。
(The gradation and classification of agricultural land in China)
11、中国农用地分等定级
classification and nomenclature of spore and pollen fossil
孢粉化石的分类和命名