为了做到这一点，研究小组使用了英国家庭成员追踪调查的数据，该数据由埃塞克斯大学编制。

To do this, the team used data from the British Household Panel Survey compiled by the University of Essex.

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根据追踪调查消费者行为的市场调查公司comScoreNetworks的数据显示，不包括送货费用在内，去年通过互联网购物的费用约为820亿美元，比2004年增长24%。

Excluding travel, some $82 billion was spent last year buying things over the internet, 24% more than in 2004, according to comScore Networks, which tracks consumer behaviour.

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因此，验证调查数据是否真实可靠是这次追踪调查工作的关键。

Therefore, test and verity investigate data's truth is this follow - up investigate's key.

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本服务提供包含用户数，收益及ARPU的主要实际成果数据追踪调查。

The service tracks key performance data, including subscriber numbers, revenues and ARPU.

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本服务提供包含用户数，收益及ARPU的主要实际成果数据追踪调查。

The service tracks key performance data, including subscriber numbers, revenues and ARPU.

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