a book used as a standard work for the study of a particular subject
教科书,课本。
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
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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。