美股半导体指数回吐开盘涨幅后下跌2%。

Core Viewpoint - The semiconductor index in the US stock market experienced a decline of 2% after initially gaining at the opening [1] Group 1 - The semiconductor index showed a reversal from its opening gains, indicating potential volatility in the sector [1] - The overall market sentiment may be affecting the semiconductor stocks, leading to this downturn [1]