In 1995 , the u . s . government estimated that over 154 , 000 hectares of opium poppies produced 2 , 340 tons of opium gum in burma alone , making it by far the largest source in southeast asia . however , in southwest asia , afghanistan alone produces nearly half as much as burma 美国汽车厂商的创新再配合致力于以公平条件拓展全球贸易的政府，是促成我们目前成功的主因，未来也会继续促进我们在海外获利丰厚的新市场的成长。
Petroleum is the largest source of liquid fuel , and , in spite of attempts to develop synthetic fuels , and the continued use of solid fuels , world consumption of petroleum products is about four times greater now than in 1940 石油是最大的液体燃料来源，尽管我们试图发展合成燃料，而且固体燃料也在持续不断地得到应用，但现在世界石油产品的消费量还是比1940年大大地提高了大约三倍（但当今世界石油产品的消费量还是大大地提高了，大约是1940年的四倍） 。
