道指深夜跳水超500点，美股半导体下挫，英伟达跌超4%，国际油价飙升3%，特朗普不满意伊核谈判进展

Market Overview - The three major U.S. stock indices closed lower on February 27, with the Dow Jones down 1.05%, the S&P 500 down 0.43%, and the Nasdaq down 0.92% [1] - The Dow Jones Industrial Average closed at 48,977.92, down 521.28 points [2] Technology Sector - Major technology stocks mostly declined, with Nvidia falling over 4% after a previous drop of 5%, raising concerns about its reliance on a few large cloud service providers and AI startups [2] - Other notable declines included Apple down over 3%, Microsoft down over 2%, and Tesla and Facebook down over 1% [2] Semiconductor Sector - The Philadelphia Semiconductor Index fell by 1.21%, with significant drops in stocks such as NXP Semiconductors down over 2%, Qualcomm down over 2%, and AMD down over 1% [3] Banking Sector - Bank stocks showed weak performance, with JPMorgan down over 2%, Goldman Sachs down over 7%, Citigroup down over 5%, Morgan Stanley down over 6%, Bank of America down over 4%, and Wells Fargo down over 5% [3] Energy Sector - Energy stocks mostly rose, with ExxonMobil up over 2%, Chevron up over 1%, ConocoPhillips up over 2%, and Occidental Petroleum up over 3% [4] - Oil prices increased by over 3% due to escalating geopolitical tensions between the U.S. and Iran, alongside OPEC+'s decision to maintain production levels [4] Commodity Market - Precious metals saw gains, with spot gold rising nearly 2% to $5,278.3 per ounce and spot silver up over 6% to $93.7 per ounce [4] - February saw spot gold accumulate a rise of 7.84%, while COMEX gold futures rose by 11.27% [4] Cryptocurrency Market - Major cryptocurrencies experienced declines, with Bitcoin dropping to $65,554.7, a decrease of 2.82% [6]