The Journal identified more than 100 middlemen - tracking companies, data brokers and advertising networks - competing to meet the growing demand for data on individual behavior and interests.
《华尔街日报》指出在这之间存有百余个中间商，其中包括跟踪公司、数据代理和广告网络，他们竞相提供大量的关于个人行为与兴趣的数据，以满足日益增长的需求。
That's because, in a sparse data set, no individual person whose behavior is being recorded is likely to exhibit more than a limited range of behaviors.
这是因为在小型数据集当中，除非其表现超出预先设定的具体范围，否则个人行为是不会被记录下来的。
In enumerative, network personal information data is arising from the network behavior to represent the individual characteristics, including personal basic information etc.
用具体列举的方式来说，网络个人信息资料是因个人从事网络活动而相关联的反映其个体特征的信息，包括个人的基本信息等。
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