美股三大股指期货转跌，其中纳指期货下跌0.18%。

Core Viewpoint - U.S. stock index futures have turned lower, with Nasdaq futures declining by 0.18% [1] Group 1 - The three major U.S. stock index futures are experiencing a downturn [1] - Nasdaq futures specifically show a decrease of 0.18% [1]