underground

英['ʌndəgraund]美['ʌndəgraund]

n.
1.地下，地铁，地道
2.秘密活动，地下组织
adj.
1.地下的
2.秘密的
adv.
1.在地下
2.秘密地，隐匿地

同：	[n.] metro, resistance, subway, subway system [a.] belowground, hole-and-corner, hugger-mugger, hush-hush

underground，subway，tube

这些名词均可表示“地铁”之意。
underground一般用词，指城市中的地铁，主要用于英国。
subway指城市中的地铁或通道，主要用于美国。
tube主要用于英国口语中。

Natural replenishment of this vast supply of underground water occurs very slowly
靠自然补充大量地下水是十分缓慢的。收藏
An underground nuclear test
地下核试验收藏
This book presents in systematic form some of the available numerical techniques for solving such underground flow systems
本书以系统的形式提出了一些解决这类地下水流体系的现行数值方法。收藏
Underground transmission is more expensive than the overhead alternative.
地下输电要比架空线输电成本高收藏
Medal of Honor Underground
荣誉勋章收藏

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a secret group organized to overthrow a government or occupation force
[同] resistance, underground
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] metro, subway, subway system, tube, underground

under the level of the ground
- belowground storage areas
- underground caverns
[同] belowground, 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
[同] hole-and-corner, hugger-mugger, hush-hush, secret, surreptitious, undercover, underground, clandestine, cloak-and-dagger

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