You can take commercial foods, like Wheaties, and go to the manufacturer and try to figure out how many boxes of these things are produced.
对象可以是麦片那样的商品,去联系制造商然后估算出,这些东西生产了多少箱
耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选
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