He says that all wireless companies do some amount of location tracking as part of their networks.
他说，作为其网络的一部分，所有无线方面的公司都会进行一些位置跟踪。
2
So it needs to rely on the national ad-placing networks, whose business model is built on tracking.
因此它需要依赖全国的广告植入网络，而这些网络的商业模式就是建立在追踪上的。
3
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.