by the book 按规则；按规则；依照惯例；循规蹈矩；严格遵守章法

【例句】
If you go by the book you shouldn't have any trouble with the government.
你如果循规蹈矩，就不会和政府闹出任何麻烦来。

He's always careful to do things by the book.
他总是小心翼翼地按规章办事。