by the book
按照規定或原則辦事；切實履行職責
正式·強調嚴格遵守規則
英文釋義
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.
典故來源
源自宗教或法律文本，指嚴格按照書面規則行事，強調不偏離既定程序。