merchant copper

例句：

1. 1. The merchant copper wasused to make the coins.
   商人铜被用来制作硬币。
2. 2. The merchant copper was avaluable commodity in ancient times.
   商人铜在古代是一种宝贵的商品。
3. 3. The merchantcopper was often used as a decorative item.
   商人铜经常被用作装饰品。