The term underground art can be considered paradoxical in the sense that as soon as specific examples of such art are defined or publicized, they cease to be truly underground anymore.

地下艺术这个词就某种意义上说是相当矛盾的。因为一旦某种地下艺术被界定或者被大众化，它们就不再是真正的地下艺术了。

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Underground art usually challenges or rejects the cultural status quoin some way, and may involve extreme doses of originality and experimentation in terms of its content, form or context.

地下艺术总是以某种形式挑战和对斥文化现状，并且从其表现内容、形式和构架上可能都牵涉着极端的原创性和实验性。

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Unlike many others, Yumiko discovered Robert Williams (Juxtapoz founder and underground art legend) at a young age, and began to foster an aesthetic that weaved together pieces of both cultures.

与众不同的是，由美子小时候就接触了罗伯特·威廉姆斯的作品（Juxtapoz杂志的创立者和地下艺术的传奇人物），开始孕育出一种交织融汇两钟文化的审美趣味。

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In two thousand six a nearby art museum began an underground building project.

VOA: special.2010.04.07

The posters are among a number of art pieces regularly placed on advertising boards on the underground by Art Below.

BBC: Margaret Thatcher art posters banned from Tube

But he claimed that rescue operations of this nature are not unusual in a country where there is still more art underground than overground, and where archaeologists must battle the twin threats of rampant development and violent looting.

ECONOMIST: Chinese archaeology

The commission, from Art on the Underground, is part of celebrations to mark the Tube's 150th anniversary.

BBC: Mark Wallinger unveils labyrinth Tube art