上证指数短线走低，日内失守3500关口，深证成指转跌，保险、小金属、有机硅等概念跌幅居前；全市约1800股上涨，3400股下跌，主力资金净流出超310亿元。

Group 1 - The Shanghai Composite Index has declined short-term, falling below the 3500 mark, while the Shenzhen Component Index has also turned negative [1] - Sectors such as insurance, precious metals, and organic silicon have experienced significant declines [1] - Approximately 1800 stocks rose, while 3400 stocks fell, indicating a net outflow of over 31 billion yuan in capital [1]