double nickel

例句：

1. 1.The shopkeeper doubled the price of the goods to make a profit.
   店主将商品价格翻倍以获利。
2. 2. He found a double nickel in his pocket and decided to keep it as a lucky charm.
   他在口袋里发现了一枚双镍币，决定保留作为幸运符。
3. 3. The old man kept two double nickels for safekeeping.
   老人保留了两枚双镍币以防万一。