N-UNCOUNT [oft NOUN n]直接邮寄广告;直邮广告Direct mail is a method of marketing which involves companies sending advertising material directly to people who they think may be interested in their products. 直接邮寄广告;直邮广告 [business]
...efforts to solicit new customers by direct mail and television advertising.
通过直接邮寄广告以及电视广告的方式赢得新顾客的尝试
Direct mail advertising is of course a huge business.