美国已变得严重依赖世界经济。现在,美国工业品供应的20%多需要进口。制造业每六个人中;就有一个是在为出口服务。每五英亩美国农田中,就有二英亩生产出口产品。美国公司将近三分之一的利润得自它们的出口和国外投资。美国需要的42种最重要的工业原料中, The United States has become heavily dependent on the world economy. More than 20% of U.S. industrial supplies are now imported. One out of every six people in the manufacturing industry is serving export. Of every five acres of U.S. farmland, two acres produce export products. Almost a third of U.S. companies profit from their exports and foreign investments. Among the 42 most important industrial raw materials that the United States needs,