词典释义：
beneath the surface of the ground
在地下
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miners working underground .地下作业的矿工。
in or into secrecy or hiding, especially as a result of carrying out subversive political activities
（尤指从事颠覆活动）秘密地，不公开地
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many were forced to go underground by the government .政府使许多人被迫转入地下活动。
situated beneath the surface of the ground
位于地下的
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an underground car park .地下停车场。
of or relating to the secret activities of people working to subvert an established order
秘密的，地下的
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Czech underground literature .捷克地下文学。
of or denoting a group or movement seeking to explore alternative forms of lifestyle or artistic expression; radical and experimental
先锋派的；急进探索的
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the New York underground art scene .纽约先锋艺术景观。
(常作
〈英〉 （尤指伦敦）地铁
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travel chaos on the Underground .地铁运营混乱
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he'd gone home by underground .他已乘地铁回家。
a group or movement organized secretly to work against an existing regime
（反对现有政权的）地下组织或运动。
a group or movement seeking to explore alternative forms of lifestyle or artistic expression
先锋派组织或运动
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the late sixties underground .六十年代后期的先锋派运动。
lay (cables) below ground level
铺（电缆）于地下。
