沪深京三市成交额超1.5万亿元，较上日此时缩量2298亿元

Group 1 - The core point of the news is that the trading volume in the Shanghai, Shenzhen, and Beijing markets has exceeded 1.5 trillion yuan, indicating a decrease of 229.8 billion yuan compared to the same time the previous day [1] Group 2 - The trading volume reflects a significant contraction in market activity, which may suggest a cautious sentiment among investors [1]