On February 28, according to market data, as of the close of the US stock market this morning, the Dow index initially closed down 0.4%, the S & P 500 index fell 1.58%, the Nasdaq index fell 2.78%, and NVIDIA (NVDA. O) closed down 8.4%. In addition, the Hang Seng Index and the Hang Seng Technology Index both fell by more than 1% during the day, the Nikkei 225 index fell by 3%, and South Korea's KOSPI index fell by 2%.