沪银期货主力合约高位跳水，涨幅收窄至2.9%

Core Viewpoint - The main focus of the news is the significant fluctuation in the Shanghai silver futures market, where the leading contract experienced a sharp decline after initially rising, indicating volatility in commodity trading [1]. Group 1 - The Shanghai silver futures main contract saw a high drop, with the increase narrowing down to 2.9% after reaching a peak rise of over 7.6% during the midday session [1].