单词 回函 例句 DEFINITIVE EXAMPLES 权威例句〔ANSWER〕It is usual to send a formal reply to a wedding invitation. 收到婚礼请柬后一般要寄一封正式的回函。朗文写作活用〔mail〕Your reply must have been lost in the mail.你的回函肯定在邮寄中丢失了。外研社新世纪...