A transaction is a unit of activity within which multiple operations on data can be made atomic (indivisible), such that exactly all or none of the actions are made permanent.

事务是一个活动单元，其中数据的多个操作可以被原子化(不可分)，精确地说就是所有的活动都是永久的，或者没有一个活动永久的。

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This measures the electrical activity of the wearer's brain, in much the same way as some machines used for medical and research proposes, and communicates wirelessly with a clock unit near the bed.

与一些用于医疗研究的机器所采用的方法非常相似，它可以测量佩戴者的脑电波活动，并且可以与佩戴者床边的一个时钟部件进行无线连接。

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This technique works fine if you have a single database maintenance activity within the logical unit of work (LUW).

如果在逻辑工作单元(LUW)中维护一个数据库活动，那么这一技巧将非常有用。

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But multi-unit buildings accounted for the highest share of construction activity in New York (91%) and San Francisco (90%).

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Depending on where interest rates head, "we could see an increase in this type of activity, " says Brad Blackwell, portfolio business manager of Wells Fargo's home-mortgage unit.

WSJ: Betting the House on the Stock Market | Jumbo Jungle

In a statement the Met said funding from organisations was used in several areas of police activity such as the Dedicated Cheque and Plastic Crime Unit.

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