Keeping track of the machine inventory and the applications running throughout a data center can easily become overwhelming.

持续跟踪机器存货和整个数据中心运行的应用程序很容易使人不堪重负。

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At its most basic level, a roller coaster is a machine that USES gravity to send a train along a winding track.

从最基本的层面来说，过山车是一种利用重力让车体沿着弯曲轨道运行的机器。

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But for now, most participants are more interested in signs that Wall Street is back on track as a money-making machine, whatever the legal and public-relations woes of some firms from past actions.

但是现在来说，大部分参与者仍然对华尔街作为赚钱机器的能力很感兴趣，相比之下华尔街公司过去的行为在法律和公共关系方面造成的影响就很差了。

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It explained that this was "because the previous train, an engineers' on-track machine, had passed through the crossing in the opposite direction to normal".

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Completed in just 10 days on a two-track machine, it takes his no-frills approach to recording to new heights - resulting in a refreshingly direct sound.

BBC: CD Review: Frank Black

There is fundamental difference between the attachment of cookies to track where a machine has been in support of targeted advertising and systems that gain access to the personal information on the machine.

FORBES: The Economics Of Online Privacy