比如我们想表达：美国是世界第一大经济体，中国紧跟其后，成为世界第二大经济体。经济体就是：economy，说经济体还有一个好处就是，比如欧盟我们可以当作一个经济体。
America is the largest economy in the world, followed closely by China.
描述如今全球经济现状，就是下滑低迷状态，距离复苏还有好几年时间。The world economy is in recession and it will last some years before it can recover.
中国经济的快速发展，为社会积累大量财富，也为国家赚取大量的外汇(foreign exchange)，这些都非常有利于一个国家的发展，和人民生活水平的提高。
The vigorous economy in China helps to accumulate a great deal of social fortune, and earns large amount of foreign exchange, which will facilitate the rise of people”s living standards and the developm
