英伟达市值一夜蒸发1456亿，科技股风险加剧引发市场动荡

Group 1 - Nvidia's market value recently dropped by $145.6 billion amid a broader decline in tech stocks, drawing significant attention [1] - The decline in Nvidia's stock price was closely linked to its earnings report and a slight adjustment in revenue forecasts, raising concerns about future growth sustainability [1] - The volatility in Nvidia's stock reflects a broader trend among large tech stocks, indicating investor sensitivity to high valuations [1] Group 2 - Market analysts suggest that Nvidia and other large tech companies may be overhyped and vulnerable to manipulation by large capital [2] - Future pressures on Nvidia will come from regulatory policies, market capitalization management, and behaviors of large investors [2] - The tech sector's performance is expected to remain uncertain, necessitating careful evaluation of company fundamentals by market participants [2]