[] a service in which a company provides a card, an envelope, etc. that a possible customer can use to send a reply. The customer does not have to use a stamp but the company pays only for the replies that are sent back to them 回函邮资已付◆Sign the form and send it back to us reply paid. 在表格上签字并寄还给我们，回函邮资已付。◆a reply-paid card/envelope 邮资已付的明信片／信封➡business reply service , postage paid