adj. 1.地(面)下的。 2.隐蔽的，秘密的。 3.(电影，报刊等)标新立异的，试刊的，试验性而非正式的。 4.反传统的，反现存体制的，激进的，(艺术等)先锋派的。 n. 地面下层；地下空间，地道；〔英国〕地下铁道 (＝ 〔美国〕 subway); 〔the underground〕 地下活动，地下组织。 an underground cellar 地下室，地窖。 underground water 地下水。 underground intrigues 阴谋。 underground movement 地下活动。 underground party 地下团体，秘密组织。 adv. 在地下；秘密地；偷偷地。 go underground 潜入地下。
beneath the surface of the earth; "water flowing underground"
in or into hiding or secret operation; "the organization was driven underground"
beneath the surface of the earth; "water flowing underground"
in or into hiding or secret operation; "the organization was driven underground"
conducted with or marked by hidden aims or methods; "clandestine intelligence operations"; "cloak-and-dagger activities behind enemy lines"; "hole-and-corner intrigue"; "secret missions"; "a secret agent"; "secret sales of arms"; "surreptitious mobilization of troops"; "an undercover investigation"; "underground resistance" 同义词：clandestine, cloak-and-dagger, hole-and-corner, hugger-mugger, hush-hush, secret, surreptitious, undercover,
under the level of the ground; "belowground storage areas"; "underground caverns" 同义词：belowground,
an electric railway operating below the surface of the ground (usually in a city); "in Paris the subway system is called the `metro'' and in London it is called the `tube'' or the `underground''" 同义词：metro, tube, subway system, subway,
a secret group organized to overthrow a government or occupation force 同义词：resistance,
例句与用法
1.
Earthquakes take place far underground . 地震则发生在地球的极深处。
2.
This confused the whole underground movement . 这打乱了整个地下活动。
3.
This underground vault is theftproof . 这所地下保管库是防盗的。
4.
Torrential rivers are rumbling deep underground . 急流在地下深处隆隆奔腾。
5.
The cavers discovered a vast underground chamber . 探穴人发现了一个地下大洞穴。
6.
We travelled by the underground as far as aldersgate . 我们坐地铁一直到奥尔德斯盖特。
7.
The underground buildings are semicylindrical in design . 这种地下建筑物设计成半圆筒形的。
8.
This type of behavior is not associated with underground shock . 在地下冲击波中，这种状况并不出现。
9.
So sunken and suppressed it was that it was like a voice underground . 它是这样的低沉而咽塞，好象是地下的声音。
10.
The roots are the underground parts of the tree that supply it with nourishment . 树根是树的地下部分，用于供应养分。
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