为什么要买黄金？这个问题的答案涉及到多个方面，以下是对这个问题的解析以及英文翻译对照：

首先，黄金是一种避险资产，可以有效地对冲通货膨胀和市场风险。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 buy gold? The answer to this question involves multiple aspects. Firstly, gold is a safe haven asset that can effectively hedge against inflation and 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，黄金可以作为投资组合中的一种资产配置，以降低投资组合的总体风险。将一部分资产配置给黄金可以有效地分散投资组合的风险，从而降低投资组合的整体风险水平。英文翻译为：Secondly, gold can serve as an asset allocation in investment portfolios to reduce overall portfolio risk. Allocating some of the portfolio to gold can effectively diversify the portfolio's risk and lower the overall risk level of the investment portfolio.

最后，黄金还可以作为一种储备货币，与其他货币相比，其价值更加稳定。与美元和欧元等货币相比，黄金的价值不容易受到货币政策的干扰，因此被认为是一种相对稳定的储备货币。英文翻译为：Finally, gold can also serve as a reserve currency, which is more stable in value compared to other currencies. Compared to currencies such as the US dollar and the euro, gold's value is not easily affected by monetary policies, making it considered a relatively stable reserve currency.