[Afternoon Commentary: The Science and Technology Innovation 50 Index rose 1.79% in half a day, and wind power stocks collectively strengthened] On September 15th, the GEM index fell after rising in early trading, and the Science and Technology Innovation 50 Index showed a strong trend. The half-day turnover of the Shanghai and Shenzhen stock markets was 1.06 trillion, a decrease of 47.5 billion from the previous trading day. More than 3,900 stocks across the market fell.盘面上，热点快速轮动，风电吉鑫科技、大金重工涨停，天顺风能4天2板；PCB澳弘电子3连板，华正新材、诺德股份、欧克科技涨停；半导体产业链表现活跃，大为股份涨停，臻宝科技、气派科技均涨超13%；网络安全概念反复活跃，中新赛克4连板，启明信息2连板。下跌方面，农业板块再度调整，新农开发、敦煌种业双双二连跌停；零售国光连锁、百大集团、国芳集团、中百集团跌停。 As of the close, the Shanghai Composite Index fell 0.1%, the Shenzhen Component Index rose 0.04%, and the ChiNext Index fell 0.18%.