尽管做了种种努力来迎合公众的需要,但消费者的心理常常是变幻无常的。他们时而喜欢这种牌子的产品,时而又喜欢那种牌子的产品,时而爱好这种类型的产品,时而又爱好那种类型的产品。
In spite of these efforts to please the public，customers are often fickle. They switch their preferences from one brand to another or from one type of product to another.
