美股科技股普跌，英伟达、微软跌超2%

Group 1 - The three major U.S. stock indices opened lower, with the Nasdaq down 1.2%, the Dow Jones down 0.8%, and the S&P 500 down 0.9% [1] - Technology stocks experienced widespread declines, with Microsoft and Nvidia both falling over 2% [1] - CoreWeave saw a significant drop of over 13%, attributed to concerns over substantial capital expenditures [1] Group 2 - Duolingo's stock plummeted by 19%, as the company's first-quarter and full-year booking outlook fell below expectations [1] - Netflix shares surged over 10% after the company withdrew from the bidding war for Warner Bros [1]