by the book
按照规定或原则办事；切实履行职责
正式·强调严格遵守规则
英文释义
follow the rules or procedures exactly; strictly adhere to the established guidelines
例句
The inspector always does his job by the book, so there's no room for shortcuts.
典故来源
源自宗教或法律文本，指严格按照书面规则行事，强调不偏离既定程序。