The fifth step is to calculate the distribution ratio of the activity driver and distribute the activity cost to different objects of cost calculation.

计算作业动因分配率，将作业成本分配至不同的成本计算对象。

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Investigators will install a data collection system in participants' cars that measures an array of driver activity.

调查者将在受试者的车上安装数据收集系统，以测量司机的一系列活动。

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The improved growth comes in part from rising consumer spending, which is the driver of most U.S. economic activity.

经济增长的部分原因是带动大部分美国经济活动的消费者支出增长。

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Any activity that distracts a driver should be illegal, be it texting or an animal on their lap.

WSJ: Bill to Ban Lap Dogs Unleashes Fight

Investment activity was the principal driver of fluctuations in the silver price in 2011, said the World Silver Survey.

FORBES: Silver Survey: Investment Key To Silver-Price Action In 2011; Mine Supply Hits Record High

Politics was a major driver of activity on Twitter in 2012, a sign not only that Twitter users do not shy away from talking politics on the platform, but that they relish the opportunity to do so.

FORBES: Politics Dominate Twitter's Year In Review