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这是一种三位数字的代码，印在信用卡的背面，多数，但不是所有的电子零售商在进行买卖交易是都要求提供这一代码。

That's the three-digit code on the back of every credit card that most, but not all, e-retailers ask for when making a purchase.

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这份写有咸牛肉、饺子和其它美味食品的菜单，背面有另一位头等舱乘客艾萨克•格拉尔德•富兰恩德尔的铅笔签名，他登上了另一艘救生艇。

The menu, which lists corned beef, dumplings and other savory items, is signed on the back in pencil by another first-class passenger, Isaac Gerald Frauenthal, who escaped on another lifeboat.

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