美股三大股指全线跳水，芯片股大涨，中概股多数下跌，阿里跌超4%，贵金属集体下挫，伦锡暴跌8%

Market Overview - US stock indices opened higher with the Dow Jones up 0.11%, Nasdaq up 0.47%, and S&P 500 up 0.22%, but later turned negative [1] - The aerospace and defense sectors led gains, with semiconductor stocks experiencing significant increases, particularly Micron Technology, which rose over 8% [3] Semiconductor Sector - Micron Technology's board member Teyin Liu purchased 23,200 shares for approximately $7.8 million, indicating confidence in the company's future [3] - Analysts from Morgan Stanley predict ASML could see a further 70% increase as chip manufacturers ramp up spending to meet surging AI demand [3] Technology Giants - The performance of the "Big Seven" tech companies was mixed, with Nvidia and Tesla rising nearly 1%, while Apple, Google, and Amazon saw declines [4] Chinese Stocks - The Chinese stock index fell over 1.42%, with notable declines in companies like Su Xuan Tang Pharmaceutical down over 14% and others like Zhihu and Century Internet down over 5% [4] Commodity Market - Precious metals experienced a collective decline, with spot gold falling to $4,590 per ounce, down 0.58%, and silver dropping to $89 per ounce, down 3.28% [4] - Copper prices dropped over 2% due to Nvidia's significant downward revision of copper demand projections [4] Storage Chip Market - Citi analysts expect storage chip prices to see "explosive increases" by 2026, raising DRAM price increase forecasts from 53% to 88% and NAND from 44% to 74% [6] - The AI investment trend is anticipated to continue throughout the year, with potential winners and losers as companies navigate this new technology [6]