[] () the percentage of people who reply to a message or an advertisement they are sent by telephone, email, post/mail, etc. 回函率；响应率；回应率◆The average response rate per message was 40%. 每条信息的平均响应率为 40%。◆We sent out over 1 000 letters, but the response rate has been low. 我们发出了 1 000 多封信，但回信寥寥无几。