Turns out, according to Daniel Cook, a historian of childhood consumerism, it was popularised as a marketing trick by clothing manufacturers in the 1930s.
据儿童消费史学家丹尼尔·库克所说，事实证明，这种做法是服装制造商在20世纪30年代为了促销而推广的一种营销手段。
This is apparently the reason McDonald’s restricts the availability of its popular McRib – a marketing trick that has turned the pork sandwich into an object of obsession.
显然这就是麦当劳限制其受欢迎的麦里芝猪排三明治供应量的原因——这是一种营销策略，使这款猪肉三明治变成了人们痴迷的对象。
The trick is not only to 19 just one or even two dimensions of the objective, but also to understand how to help people better 20 the objective.
诀窍不仅是要 19 仅仅 一个或甚至两个维度的目标，还要理解如何帮助人们更好地 20 实现 目标。
例句取自历年考研英语真题，翻译为机器生成，仅供学习参考。