It's basically a heavy metal covering that is worn for protection.

它基本上是一种用于保护的重金属覆盖物。

Part of the card has a shiny metal covering that has been glued to the paper.

卡片的一部分有一层闪亮的金属覆盖层，粘在纸上。

So what you do is you take, say, your fingernail or a small coin and you remove that shiny metal covering that is over it, and it reveals – it shows you a number.

所以你要做的就是拿起你的指甲或一枚小硬币，然后去掉上面闪亮的金属覆盖物，它就会显示——它会显示一个数字。