existing, occurring, or done under the earth's surface
存在于地面下的;地底下发生的;在地下进行的。
secret; concealed
秘密的;隐藏的
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the subterranean world of the behind-the-scenes television power brokers. 幕后电视权力经纪人的隐秘世界。
"early 17th cent.: from Latin