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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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

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

Mr. BENJAMIN JOHNSON (Immigration Policy Center): When state and local officials begun their own roundup and their own sweeps, it makes it more difficult to deal with undocumented immigration because it drives people deeper and deeper underground.

NPR: U.S. Communities Act on Immigration Issues