a form of advertising in which a person seeing or hearing something is not aware that it contains advertisements

Such content is often a cover for stealth advertising in which companies push their products to students under the guise of “instruction”. 这些内容往往是隐形广告的幌子，企业以“指导”的名义向学生推销自己的产品。

The study found that 90% of the newscasts analyzed had at least one instance of stealth advertising. 研究发现，在被分析的新闻广播中90%都至少含有一个隐形广告。