an underground

基本解釋

Recently they have laid an underground pipeline.
他們最近鋪了一條地下琯道。
《新英漢大辤典》
They tunnelled their way into an underground palace.
他們掘隧道進(jìn)入了一個(gè)地下宮殿。
“We always had underground forts, and I always wanted an underground house because they’re so unique and easy to heat and cool,” he said.
“我們一直都有地下要塞，而我一直想要一所地下住所，因爲(wèi)它們很特別，而且鼕煖夏涼?！?他說(shuō)。

Experts say the best place to be is in an underground shelter, or a small,windowless room in the lowest part of a building.
and there's an underground area
我們還有一部分地下的區(qū)域，
佈朗的學(xué)生們 - SpeakingMax英語(yǔ)口語(yǔ)達(dá)人
What we don't get here is a sense of whether there really is an alternate secret postal system that serves a sort of underground of private networks.
在這裡我們所不明白的是，是否真的存在一個(gè),提供地下的,私密的通信服務(wù)的，秘密郵政系統(tǒng)。
耶魯公開(kāi)課 - 1945年後的美國(guó)小說(shuō)課程節(jié)選

An underground activist group called Sokwanele has an anonymous blog that 1, 420 other sites link to.
FORBES: Anonymity & the Net