From a secret underground base scientists try to find a way to fight the aliens.

从一个秘密的地下基地科学家试图找到一种方法打外星人。

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A carefully selected asteroid with the right density and strength could be hollowed out for an underground base to be established.

一个精心挑选合适的小行星密度和力量可以挖了一个地下基地。

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Project Seagate was a major project with a huge underground base location and they were working on many different sub-projects.

希捷工程是一个重大的工程项目，它有一个巨大的地下基地位置，那里的人员工作在许多不同的次级项目中。

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On Hainan Island it has built a new, large naval base with underground submarine pens, which can support both strategic and nuclear-attack submarines.

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Since tax evasion is a major driver of the underground economy, efforts to expand the tax base and improve tax collection can help curtail illicit flows, says Kar.

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At the base, they find large areas of the underground mall still standing as they were the morning of September 11, nearly untouched.

CNN: workers