短語詞組短語go by the letter 遵守字面條文oblige by posting letter 勞駕寄信Commissioned by the letter 委托信letter -by- 逐字母對比;字母相比by sight letter of credit 即期不可撤消信用證為付款方式stand -by y letter of credit 備用信用證by letter post 以信件方式郵寄;正在翻譯a communication by letter 通信聯(lián)系communication by letter 通信 返回 by letter