副詞 to the letter:

1. in every detail
   同義詞：to a T, just right, to perfection

1. Soldiers have to obey orders to the letter.
   戰(zhàn)士必須百分之百地服從命令。
2. I'm composing a formal reply to the letter.
   我正寫一封鄭重其事的回信。
3. She carry out all her pledge to the letter.
   她不折不扣地履行了她的所有諾言。
4. John obeyed his father's instructions to the letter.
   約翰不折不扣地按他父親的指示行事。