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道──琼斯指数，是美国用来反映股票市场行情变化的一种股票价格平均指数。它包括四组指数：第一组是30种工业股票平均指数；第二组是20种交通运输业股票平均指数；第三组是15种公用事业股票平均指数；第四组是前三组股票的综合平均指数。上述股票全都在纽约证券交易所上市。?
The Dow Jones Index is the average stock price index used by the United States to reflect changes in the stock market. It includes four groups of indices: the first group is the average index of 30 industrial stocks; the second group is the average index of 20 transport stocks; the third group is the 15 public utilities stock average index; the fourth group is the first three stocks The composite average. All of the above shares are listed on the New York Stock Exchange. ?