美股三大指数集体低开，道指跌0.76%，纳指跌2.08%，标普500指数跌1.31%。超微电脑跌超19%，公司业绩预告远不及预期。星巴克跌超9%，公司第二季度全球销售额降幅超预期。（文章来源：每日经济新闻）
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