香港恒生指数7月31日（周四）收盘下跌403.6点，跌幅1.6%，报24773.33点；香港恒生科技指数7月31日（周四）收盘下跌37.62点，跌幅0.69%，报5453.14点；国企指数7月31日（周四）收盘下跌155.32点，跌幅1.72%，报8882.95点；红筹指数7月31日（周四）收盘下跌99.8点，跌幅2.29%，报4249.7点。

Core Viewpoint - The Hong Kong stock market experienced a decline on July 31, with significant drops in major indices, indicating a bearish sentiment in the market [1] Group 1: Index Performance - The Hang Seng Index closed at 24,773.33 points, down by 403.6 points, representing a decline of 1.6% [1] - The Hang Seng Tech Index closed at 5,453.14 points, down by 37.62 points, reflecting a decrease of 0.69% [1] - The China Enterprises Index closed at 8,882.95 points, down by 155.32 points, marking a decline of 1.72% [1] - The Red Chip Index closed at 4,249.7 points, down by 99.8 points, indicating a drop of 2.29% [1]