НХЛ — регулярный чемпионат
Image by Mat Smith for Engadget。PDF资料对此有专业解读
，详情可参考爱思助手
[24]钢材产量数据中含企业之间重复加工钢材。。旺商聊官方下载对此有专业解读
Autor, David H, David Dorn, and Gordon H Hanson, "The China syndrome: Local labor market effects of import competition in the United States," American Economic Review, 2013, 103 (6), 2121–2168.