a book used as a standard work for the study of a particular subject 教科书,课本
adjective
[attrib.]conforming to or corresponding to a standard or type that is prescribed or widely held by theorists 合乎规范的;完全符合规定的;教科书式的 he had the presence of mind to carry out a textbook emergency descent. 他镇定自若地完成了合乎规范的紧急降落。