Sealing the entrances to a tunnel system is often the simplest way to disable it.

要使目标瘫痪，封闭地道系统入口通常是最简单的办法。

youdao

I have also heard about underground tunnel system that run in mazes under the surface of the planet.

我也已听说过在行星表面之下迷宫穿行的地下隧道系统。

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Winding through mountains and under highways, a man made tunnel system 44 miles long will pump the water into a reservoir.

穿山越谷，一个44英里长的人造管道系统把水抽到水库里。

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A common design looks like a high tunnel.Unlike a greenhouse, which uses a heating system, a hoop house is heated by the warmth of the sun.

VOA: special.2009.12.22

After six Eurostar trains broke down in or near the tunnel that runs under the English Channel, the system has been suspended while engineers troubleshoot the electrical problems thought to have been brought on by condensation.

VOA: standard.2009.12.21

"I heard after a while on the public address system that a fire had occurred inside the tunnel and the sprinkler system was going to be activated, " he told Jiji Press.

BBC: Japan Sasago tunnel: Collapse traps cars

Volunteers said they hoped the move would help with restoration of the entire tunnel and canal system.

BBC: Butterley tunnel gets Scheduled Ancient Monument status

With a wider tunnel and a stronger conveyor system running through the middle of it, one of InVision's airport machines can swallow a log.

ECONOMIST: Chopping wood