金属走势分化，白银反弹，黄金涨幅显著收窄，伦铜涨近4%，伦镍创14个月最高水平

Group 1 - The metal market continues to experience significant volatility as strong price increases face reversals, with investors closely monitoring price trends in this sector [1] - On December 30, spot silver rose nearly 5.6% to $76.16 per ounce, following a sell-off driven by speculative trading and supply shortage concerns that previously pushed silver prices to historic highs [1] - Spot gold briefly increased over 1.5% but retreated after reaching the 200-hour moving average, with its gains narrowing post-Federal Reserve meeting minutes, approaching the previous New York closing price of $4,335 [4] Group 2 - Base metals saw a broad increase, with London copper rising approximately 3.7%, potentially marking the longest consecutive increase since 2017, driven by expectations of increased pressure on supply chains [6] - London tin rose by 3.56%, while London zinc increased by over 1% [6] - London nickel surged over 6%, reaching a 14-month high of $16,780 per ton, continuing a rebound since mid-December, influenced by signals of production cuts from Indonesia, the world's largest nickel producer, aimed at boosting prices [8]