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Meanings of underground system in English

Cave system.

Usage of underground system in English
1
I am used to using the rail and underground system in London.
The Guardian
2
On Tinian, the underground system would protect the Tinian clinic and airport.
Radio NZ
3
Would an extensive underground system function better than a mixed system?
The Irish Times
4
The Delhi underground system was also halted briefly, commuters told the NDTV channel.
Reuters
5
We've got to organize a more efficient search of the whole underground system.
Wastelands
6
The present underground system had been built on top of the old one.
Dayworld
7
The large underground system was secretly dug by the New Zealand Engineers Tunnelling Company.
Radio NZ
8
The Cu-Chi underground system could accommodate five thousand people for up to two weeks.
Full Circle
9
The large underground system was secretly dug by the New Zealand Engineers… Audio, Gallery
Radio NZ
10
When water for irrigation is supplied from wells some underground system is generally used.
Checking the Waste: A Study in Conservation
11
Also in retaliation, the French company Cegelec has been disqualified from building the Izmir underground system.
The Irish Times
12
The wires were extended to the Treasury in London by means of the ordinary underground system.
Scientific American Supplement No. 822, October 3, 1891
13
The underground system is even more expensive, especially in view of the tremendous outlay for damages.
Scientific American Supplement, No. 810, July 11, 1891
14
The first declaration in favor of an underground system was made by the Boston company in 1880.
The History of the Telephone
15
They'd been part of the underground system that collapsed and was later gated up just in case.
Boneshaker
16
On my return, descending into the dark, putrid bowels of London's underground system was quite a shock.
The Guardian
This collocation consists of:
Underground system through the time
Underground system across language varieties
United States of America
Common
United Kingdom
Common