The rules and structure of a language

• The study of these rules and how sentences work
• Prescriptive notions about correct usage

一种语言的规则与结构

• 对这些规则及句子运作的研究
• 关于正确用法的规范观念

A book explaining a language’s grammar; a textbook

讲解某种语言语法的书；教材

A formal specification of the syntax of a formal language

形式语言语法的正式规范

The basic rules or principles of a field or skill

某一领域或技能的基本规则或原理