They are a kind of semantic category in the language without the number category at most.

在无“数”的语言中至多是一种语义范畴。

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The singular and plural are a kind of grammar category in the language with the number category.

单、复数在有“数”范畴的语言中是一种语法范畴。

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Recently, a book on an empirical study of number category of nouns in Chinese and English was published, which is worth reading.

近来知识产权出版社出版了一部基于汉英名词数概念差异试验的专门著作，颇为可读。

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And in terms of social media and mobile, such as Facebook, iPhone, iPad and Android, the number one category in applications is games.

FORBES: Playing the Ad Game

The increasing number of Category 2 centres reflects the growing interest of UNESCO Member States in contributing to the work of the Organization by offering a new mechanism and modality of programme implementation.

UNESCO: OFFICE IN DHAKA

It rocketed to number one in the finance category and number four in the overall App Store.

FORBES: iZettle Lets Europe's Mom-and-Pops Take Chip-Cards