B2 below the surface of the earth; below ground在地下(的),在地面以下的
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.
An underground activity is secret and usually illegal.秘密的(地);地下的(地)
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(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
A2 a railway system in which electric trains travel through tunnels below ground地铁
[ U ] people in a society who are trying new and often shocking or illegal ways of living or forms of art先锋派团体
a group of people who secretly fight against the government(反政府的)地下组织
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