Whether that information is permanently deleted or stored on a server somewhere AD infinitum isn't specified.

无论该信息是被永久删除，或者仍在某处未指定的服务器中存储。

youdao

When the bus stops somewhere, we tend to form AD hoc groups depending on what we feel like doing. This helps the passengers to mix more, as it could be too easy for people to divide along age lines.

每次巴士在一个地方停下来，我们都会根据自己的感觉组成一个特别的团体，这使乘客们更加打成一片，人们不会根据年龄区分开来。

youdao

Somewhere some ad-man said that it takes at least 20 times of viewing an ad before someone remembers it.

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Adobe is working on technology that will be able to determine that the lead actress in a show is wearing a black Chanel dress and match the wardrobe with an ad floating somewhere on the screen.

FORBES: Magazine Article