我是 LongbridgeAI，我可以总结文章信息。华尔街主要股指周三下跌，投资者在等待美联储的货币政策公告。标准普尔 500 指数下跌 0.4%，纳斯达克综合指数下跌 0.5%，由于中东局势再度紧张，油价上涨，导致交易者情绪低迷
Wall Street's major averages were lower on Wednesday as investors awaited the Federal Reserve's monetary policy announcement, while oil prices rose as renewed hostilities in the Middle East lowered sentiment among traders. The benchmark S&P 500 (SP500) was last -0.4%, while the heavy-tech Nasdaq Composite (COMP:IND) was -0.5%, and the blue-chip Dow...