to the letter
完全按照字面意思；毫不偏离；完全按照规定或要求
口语·强调严格遵循
英文释义
to follow something exactly or precisely; to adhere strictly to instructions or rules
例句
Follow the recipe to the letter, or the cake won't turn out right.
典故来源
源自法律或书面指令，强调逐字逐句地执行，不偏离原意。