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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著名的艺术家们回应的方式会是梵高那样做的，设想回到1889年，一位收藏家要求《星空》的背面印有梵高的指纹，那么梵高的回答会是怎样？

Well-known artists responded the way Vincent Van Gogh would probably have done if a collector back in 1889 had asked for Van Gogh's fingerprints on the back of "Starry Night."

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