I remember thinking about a middle-aged man standing at a checkout counter. Something set him apart.

我想起一个站在收银台旁边的中年男士，有一些东西使他显得与众不同。

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Imagine that you were only allowed to fly on one airline, or take a single route to work, or use one designated checkout counter at the grocery store.

想象一下，你只能使用一家航空公司，或者只走一条路去工作，或者在杂货店只能使用一个指定的收银台。

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Suppose you are in a long line at checkout counter 1 — you can roughly guess how long it would take to move up in that line.

假设您排在1号付款台前的长队中，您可以粗略地估算出大概需要多久时间才能排到自己付款。

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The Wall Street Journal reports that Google is joining Citigroup and Mastercard to set up a mobile payment system that would let Android users wave their phones in front of a small reader at a checkout counter to pay for something.

FORBES: Morning Tech Wrap: Apple, Google, Firefox

Three major U.S. mobile operators have created a joint venture known as ISIS, which intends to build a mobile payment solution that will allow consumers to make purchases at retail stores with just a wave of a mobile phone at the checkout counter.

FORBES: The ISIS Mobile Wallet: Are Visa, MasterCard and PayPal Under Siege?

It means that I can use my PayPal account and at the checkout counter, I just use my cellphone number and a pin.

FORBES: How To Protect Yourself From PayPal Identity Theft