n.种类；类别；范畴
There are different categories of books in a library. 图书馆里有各种不同种类的书籍。
They fall into different categories. 他们属于不同的类别。
How can a scientific category have its derivatives? 科学范畴何以能衍生?
His research does not belong to the category of natural science. 他的研究不属于自然科学范畴。
category在哲学上指“范畴”，可作class的同义词，但比class的含义少。
n.子范畴；亚类
