为什么黄金保值？这个问题的答案涉及到多个方面，以下是基于这个问题的解析以及英文翻译对照：

首先，黄金是一种贵金属，其价值被广泛认可，被视为一种避险资产。在全球经济不确定性的情况下，黄金通常被视为一种相对稳定的投资工具。投资者购买黄金可以规避资产贬值的风险，同时也可以在通货膨胀的情况下保护自己的购买力。英文翻译为：Why does gold appreciate in value? The answer to this question involves multiple aspects. Firstly, gold is a precious metal whose value is widely recognized. It is regarded as a safe haven asset that hedges against market risks. In the face of global economic uncertainty, gold is often regarded as a relatively stable investment vehicle. Investors can purchase gold to avoid the risk of asset depreciation and also protect their purchasing power against inflation.

其次，黄金的供应相对有限，而需求却不断增加。随着全球经济的发展和人们生活水平的提高，人们对黄金的需求越来越大。由于黄金的供应有限，而需求不断增加，这使得黄金的价格不断上涨，从而保值增值。英文翻译为：Secondly, the supply of gold is relatively limited, while demand continues to increase. With the development of the global economy and the improvement of people's living standards, people's demand for gold is constantly increasing. As the supply of gold is limited, but demand continues to rise, this drives up the price of gold, thereby maintaining its value.

最后，黄金是一种高流动性的资产，容易进行交易和兑换。这使得黄金成为一种理想的投资工具，可以在不同的市场和不同的时间进行交易和兑换。英文翻译为：Finally, gold is a highly liquid asset that is easy to trade and exchange. This makes gold an ideal investment vehicle that can be traded and exchanged in different markets and at different times.