Baiyin copper smelting process

例句：

1. 1. The Baiyin region is famous for its mineral resources.
   白银地区以其矿物资源而闻名。
2. 2. The ancient Chinese emperors valued Baiyin as a symbol of wealth and power.
   古代中国的皇帝将白银视为财富和权力的象征。
3. 3. Silver mining has become an important industry in the Baiyin region.
   银矿开采已成为白银地区的一个重要产业。