为什么黄金大跌？这个问题涉及到许多复杂的因素，下面我们来一一解析。

首先，黄金价格的波动受到全球经济形势的影响。当全球经济出现衰退或通货膨胀预期增强时，投资者通常会选择购买黄金以保值增值。然而，当经济形势好转或通货膨胀压力减轻时，投资者可能会减少对黄金的购买，导致黄金价格下跌。英文翻译为: Why has gold fallen? This question involves many complex factors. Let's analyze them one by one.

Firstly, the fluctuations of gold prices are influenced by the global economic situation. When the global economy is in recession or the inflation expectation increases, investors usually choose to buy gold to maintain and increase their value. However, when the economic situation improves or inflationary pressure eases, investors may reduce their purchases of gold, leading to a drop in gold prices.

其次，货币政策也是影响黄金价格的重要因素之一。例如，当中央银行降低利率或增加货币供应时，货币变得相对较为便宜，而黄金作为避险资产的吸引力可能会降低，从而导致黄金价格下跌。英文翻译为: Monetary policy is also an important factor affecting gold prices. For example, when the central bank cuts interest rates or increases money supply, money becomes relatively cheaper, and the attractiveness of gold as a safe haven asset may decrease, resulting in a drop in gold prices.

最后，技术创新和环保法规也影响了黄金价格。例如，随着电动汽车的普及，对白银的需求可能会增加，而白银通常和黄金价格相关联，因此这可能会导致黄金价格下跌。英文翻译为: Technological innovation and environmental regulations have also affected gold prices. For example, with the popularity of electric vehicles, the demand for silver may increase, and silver is usually associated with gold prices, which may lead to a drop in gold prices.