中概股多数下跌，百度跌4%，钯金狂飙6%，贵金属全线大涨，比特币击穿8.7万美元

Market Overview - US stock indices opened higher on December 15, with the Dow Jones up 0.33%, S&P 500 up 0.48%, and Nasdaq up 0.58%, but later all indices erased their initial gains [1] - As of 23:27, the Dow Jones Industrial Average was at 48,341.39, down 116.66 points or 0.24%, Nasdaq at 23,048.60, down 146.57 points or 0.63%, and S&P 500 at 6,806.35, down 21.06 points or 0.31% [2] Technology Sector Performance - Major tech stocks showed mixed results, with Tesla initially rising 4.7% and Nvidia up 1.5% before both lost their gains [2] - Chip stocks continued to decline, with Oracle and Broadcom down nearly 4%, and iRobot's stock plummeting 69% after announcing bankruptcy [2] Chinese Stocks Performance - The Nasdaq China Golden Dragon Index fell nearly 1.7%, with Baidu down over 4%, Alibaba down over 3%, and Li Auto down over 2% [3] - Multiple Chinese concept stocks experienced significant declines, with some dropping over 10%, including Sihong International which fell over 30% [4][5] Precious Metals Market - There was a significant influx of capital into safe-haven assets, pushing spot gold close to historical highs, with silver rising 3% [6] - Platinum futures prices broke above $1,800 per ounce, with a nearly 100% increase year-to-date, significantly outpacing gold's 65% rise [7][8] Economic Indicators - The US Labor Statistics Bureau is set to release the November employment report and part of October's data, with economists predicting a non-farm payroll increase of 50,000 and an unemployment rate of 4.4% [11]