The development and application of civil construction technology for the deeper underground engineering is an important research topic with the utilization of larger and deeper underground space.

随着城市基础设施建设以及地下空间开发利用的不断大深度化、大规模化，大深度土木施工技术的开发及其实用化显得愈来愈重要。

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But a new look at Titan's insides reveals even more oddities: Beneath the brittle crust of ice lies a layer of slush. Deeper still is an underground ocean over a solid core of rock and ice.

但最近对泰坦内部的一项新研究却揭开了这颗奇异星球更为怪诞的一面：脆弱的甲烷冰地表之下，覆盖着一层冰泥，更深处依然是一个地下海洋，最中间是冰和岩石并存的固态核心。

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Scientists are looking to relocate an underground experiment searching for dark matter to an even deeper site.

科学家希望在更深的地底处重新建立寻找暗物质的实验。

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Sheikh Mogra said grooming should be seen purely as criminal behaviour, and using "labels of race or religion" could "drive the problem deeper underground".

BBC: Shaykh Ibrahim Mogra of the Muslim Council of Britain

Although the production has gone deeper underground, at least China, unlike Hong Kong, has shown it can be pushed into making software pirates walk the plank.

ECONOMIST: Intellectual property

If he only wants to take the skeleton and try to put an end to the black market, he will have a fight and will only drive the black market deeper underground.

NEWYORKER: Bones of Contention