cupro-nickel coin

例句：

1. 1. Thisis a rare copper-nickel alloy coin that's worth thousands of dollars.
   这是一枚罕见的铜镍合金硬币，价值数千美元。
2. 2. The ancient Egyptians used copper-nickel alloy coins for trade and exchange.
   古埃及人使用铜镍合金硬币进行贸易和交换。
3. 3.The collectors are always looking for rare copper-nickel alloy coins to add to their collection.
   收藏家们总是在寻找稀有的铜镍合金硬币来添加到他们的收藏中。