There are other factors involved too like high energy prices, but certainly U.S. policy is affecting that, but we're also affected by the rest of the world.

还有诸如能源价格高昂等其它因素,但美国的政策肯定是有影响,但世界其它地区的情况也影响了我们

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选