Sometimes, by buying something cheap now, you will be costing yourself more in the long run.
有时候你花了很少钱买了便宜货,但它日后可能要花掉更多的钱。
In their efforts to persuade us to buy this or that product, advertisers have made a close study of human nature and have classified all our little weaknesses.
做广告的人在力图劝说我们买下这种产品或那种产品之前,已经仔细地研究了人的本性,并把人的弱点进行了分类。