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。
studies of childhood consumption
儿童消费研究
Michelle Obama has launched a high-visibility campaign 20 childhood obesity, even claiming that it represents our greatest national security threat.
米歇尔·奥巴马发起了一场针对儿童肥胖的高曝光度活动，甚至声称这代表我们最大的国家安全威胁。
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。