A股成交额逼近4万亿元，上证指数收跌0.31%

Group 1 - The core point of the article highlights that the A-share market's trading volume approached 4 trillion yuan, setting a new historical high [1] - The Shanghai Composite Index experienced a decline of 0.31%, while the ChiNext Index increased by 0.82% [1] - Active sectors included AI applications, financial technology, computing hardware, smart wearables, and healthcare services [1] Group 2 - Sectors that faced a pullback included lithium mining and commercial aerospace themes [1] - The insurance, banking, and real estate sectors showed a downward trend [1]