美股三大股指期货跌幅扩大，纳斯达克100指数期货跌1%，道琼斯指数期货跌0.18%，标普500指数期货跌0.61%

Group 1 - The U.S. stock index futures are experiencing a decline, with the Nasdaq 100 index futures down by 1% [1] - The Dow Jones index futures have decreased by 0.18% [1] - The S&P 500 index futures are down by 0.61% [1]