美股三大股指期货扩大跌势，道指期货现跌0.5%，标普500指数和纳斯达克100指数期货下跌约0.7%。

Group 1 - The three major U.S. stock index futures have expanded their decline, with Dow futures down 0.5% [1] - S&P 500 index futures and Nasdaq 100 index futures are both down approximately 0.7% [1]