The father buys,the son bigs,the grandchild sells,and his son thigs.
父买、子修建、孙儿卖,重孙街上当乞丐。
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。