美股期货跌幅扩大，道琼斯指数期货跌0.33%，标普500指数期货跌0.67%，纳斯达克100指数期货跌1.06%

Group 1 - US stock futures have expanded their decline, with Dow Jones futures down 0.33% [1] - S&P 500 futures have decreased by 0.67% [1] - Nasdaq 100 futures have fallen by 1.06% [1]