underground
adjective, adverb uk/ˌʌn.dəˈɡraʊnd/ us/ˌʌn.dɚˈɡraʊnd/
(BELOW EARTH)
B2 在地下（的），在地面以下的
below the surface of the earth; below ground
an underground cave/passage/cable 地下洞穴／通道／电缆
Moles live underground. 鼹鼠生活在地下。
- More examples
- He suffers from claustrophobia so he never travels on underground trains.
- Ten miners were trapped underground when the roof of the tunnel fell in.
- Electrical power is supplied by underground cables.
- Planes bombed the guerrilla positions yesterday in an attempt to flush out snipers from underground tunnels.
- His grandfather had bought the land as an investment, guessing that there might be gold underground.
(SECRET)
秘密的（地）；地下的（地）
An underground activity is secret and usually illegal.
an underground newspaper/movement 地下报纸／运动
The Communist Party was forced (to go) underground, and its leaders went into hiding. 共产党被迫转为地下活动，其领导人也隐藏了起来。
the underground railroad （十九世纪在美国用来帮助南方黑奴逃脱至废除了黑奴制度地区的）地下铁路
a secret system, used in the 19th century, by which slaves (= people who had been sold and forced to work) in the southern US were helped to escape to places where there was no slavery
They told us the stories of some of the main figures in the underground railroad.
Gerrit Smith was one of the most important financiers of the underground railroad.
They came up with the idea of a museum devoted to the underground railroad.
He acted as a "conductor" on the underground railroad, finding shelter for escaping slaves.
We attended a talk about the underground railroad.
underground
noun uk/ˈʌn.də.ɡraʊnd/ us/ˈʌn.dɚ.ɡraʊnd/
(TRANSPORT)
the undergroundA2 [ S ] UK (also the tube) 地铁
a railway system in which electric trains travel through tunnels below ground
the London Underground 伦敦地铁
They went on the underground. 他们乘地铁去的。
(PEOPLE)
[ U ]先锋派团体
people in a society who are trying new and often shocking or illegal ways of living or forms of art
In Britain and the USA in the 1970s, the underground was a powerful subversive force. 20世纪70年代，先锋派团体在英国和美国是一支强大的颠覆性力量。
the underground （反政府的）地下组织
a group of people who secretly fight against the government
He was a member of the underground, harassing the invading army. 他是袭扰侵略军的地下组织成员。