Unfortunately, it is sometimes desirable to have more control over a transaction than simply rolling back every change in the current transaction.

可惜的是，有时候需要的是对事务多一点的控制，而不是在当前的事务中简单地对每一个改变进行回滚。

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A frequent requirement for data warehouses and business intelligence environments involves maintaining a rolling history of select data over a given period of time.

数据仓库和业务智能化环境的一项常见需求是，维护特定时间段内滚动变化的历史数据。

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If the Dreamliner starts rolling off the production line towards the end of this year, as Boeing promises, it will be billions over budget and three years behind schedule.

如果梦幻客机在今年年底开始投入生产线，就像波音承诺的那样，将会超过预算数十亿美元，而且比计划晚三年时间完成。

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We recently analyzed the returns of a hypothetical global portfolio as well as a hypothetical US-only portfolio ( 1) over rolling 3-year periods between January 1, 1999 and December 31, 2011, with each rolling period resetting monthly (see graph below).

FORBES: Why Global Diversification Still Makes Sense

Failure to reach agreement on the seven-year budget would mean the EU rolling over annual budgets - a method that would be more expensive and would complicate long-term projects.

BBC: EU budget: Leaders edge towards compromise deal

The regulations, backed by Blues owner Roman Abramovich, demand that teams in European competitions break even over a rolling three-year period from 2012-13.

BBC: Arsenal boss Arsene Wenger questions Chelsea spending