category:
n. 种类，分类；[数] 范畴
This novel falls into the category of reasoning.
这本小说属于推理类小说。
The strings are a category of musical instruments.
弦乐器是乐器的一种。
There are different categories of books in a library.
图书馆里有各种不同种类的书籍。
Time, place, quantity and quality are categories.
时、空、质、量都是范畴。
category意思是种类
