dual market of gold

例句：

1. 1.The dual market of gold is a complex issue that requires careful consideration.
   双重市场黄金是一个复杂的问题，需要仔细考虑。
2. 2.Gold mining companies have been exploring the dual market of gold for decades.
   几十年来，黄金开采公司一直在探索黄金的双重市场。
3. 3. The dual market of gold has become an important source of revenue for many countries.
   黄金的双重市场已经成为许多国家的重要收入来源。