多只热门中概股下跌，理想跌逾6%，小鹏跌近5%，黄金白银短线跳水

Group 1 - The U.S. stock market showed mixed performance at the opening, with all major indices turning positive by 10:40 PM [1] - Major Chinese companies such as Li Auto, Xpeng Motors, and Meituan experienced significant declines, with Meituan's stock dropping nearly 10% after reporting a 89% year-on-year decline in adjusted net profit for Q2 [3][14] - The announcement of a competitive environment affecting Meituan's profitability highlights the challenges faced by companies in the food delivery sector [3] Group 2 - Gold prices experienced volatility, dropping below $3,380 per ounce [6] - Silver also saw a decline, with prices falling over 1% [8] - The Federal Reserve officials have reiterated a dovish stance on interest rate cuts, indicating potential adjustments in monetary policy [9][11] Group 3 - President Trump announced the dismissal of Federal Reserve Governor Lisa Cook, raising concerns about the independence of the Fed and its implications for monetary policy [12][14] - Market reactions included a decline in the U.S. dollar index and U.S. Treasury yields, reflecting uncertainty regarding future policy directions [14] - Analysts suggest that the upcoming Fed chair nomination could influence market expectations for interest rate changes, with a potential focus on dovish policies [14][15]