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This model not only provides an effective means of reserving computer systems, but the model also provides the ability to maintain a checkout history for each user and computer system.

此模型不仅提供保留计算机系统的有效方式，而且还提供了维护每个用户和计算机系统的历史记录的功能。

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In 2005, Apple introduced electronic receipts at its stylish retail stores. More mainstream retailers found the checkout system difficult to replicate.

2005年，苹果公司在他们时尚的零售店里推出了电子收据，但当时其他主流零售商认为要模仿这个结账系统很难。

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Customers are being offered fixed credit on the firm's online payment system, Google Checkout, instead.

BBC: NEWS | Technology | Google shuts down video service

We have only just begun what is a very systematic checkout of the system.

ENGADGET: USAF relaunches its first X-37B on a slightly less mysterious spaceflight

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