市场冲高回落，沪指收跌0.22%，两市成交额萎缩近2000亿

Core Points - The market experienced a pullback after an initial rise, with all three major indices closing in the red, despite the Shanghai Composite Index briefly surpassing the 4000-point mark, reaching a ten-year high [1] - The trading volume in the Shanghai and Shenzhen markets was 2.15 trillion yuan, a decrease of 192.3 billion yuan compared to the previous trading day [1] Index Performance - Shanghai Composite Index closed at 3988.22, down 0.22%, with 984 gainers and 1273 decliners [2] - Shenzhen Component Index closed at 13430.10, down 0.44%, with 1325 gainers and 1483 decliners [2] - ChiNext Index closed at 3229.58, down 0.15%, with 690 gainers and 663 decliners [2] Sector Performance - The market saw rapid rotation of hot sectors, with the Fujian sector experiencing a surge, leading to multiple stocks hitting the daily limit [2] - The nuclear power sector was active, with stocks like Dongfang Tantalum and Antai Technology showing strong performance [2] - The robotics sector also saw gains, with companies like Qingdao Double Star and Yashichuangneng achieving consecutive limit-ups [2] - Conversely, the non-ferrous metals sector faced collective declines, with Tongling Nonferrous Metals hitting the daily limit down [3]