按职能分类的英文：
functional classification
adj. 实用的；功能的，机能的；函数的
function requester
功能请求者
norm functional
范数泛函
The divergence of a vector function is the scalar function
矢量函数的散度是一个标量函数。
A functional is a kind of function where the dependent variable is itself a function.
泛函就是自变量本身为函数的一数函数。
The frequency response function includes an aerodynamic transfer function
频率的主函数包括主动力传递函数。
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