指数短线跳水，沪指回到3500点下方，深成指翻绿

Group 1 - The index experienced a short-term drop, with the Shanghai Composite Index falling below 3500 points [1] - The Shenzhen Component Index turned negative, indicating a shift in market sentiment [1] - The ChiNext Index's gains narrowed to 0.1%, reflecting a slowdown in growth [1]