In about 200 cases, the developer created a way to track a device's identifier code; the other apps used this functionality from advertising or tracking software library.

在大约200个案例中，开发商创建了一个追踪设备识别代码的方法。其它的应用程序通过广告或追踪软件库使用该方法。

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I saw a notice in the library advertising art classes.

我看到了图书馆广告艺术课的通告。

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Google has pledged not to show advertising next to the pages of library books, but the company does sell advertising alongside search results that lead to books obtained from publishers.

NEWYORKER: Google��s Moon Shot