Direct- mail advertising includes all advertising material sent

Direct- mail advertising includes all advertising material sent by mail to lists of prospective customers. The wide variety of material used includes letters , catalogs , pamphlets , brochures,samples，and even attention-getting novelties.
【正确答案】：直接邮寄广告包括邮寄给未来顾客的各种广告资料。这些名目繁多的资料包括信件、目录单、小册子、样品。甚至还有一些引人注目、新颖而价廉的小玩意。