Design code and key technical points for main tunnel and parallel heading of East Qinling Super-long Tunnel are introduced.

介绍东秦岭特长隧道工程正洞及平行导坑的设计标准、施工技术要点。

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The accident started with a gas leak that let gas pour into the main tunnel and trigger an explosion due to poor ventilation.

事故由瓦斯泄露引起，在通风不畅的情形下，瓦斯涌入主要通道，引发了爆炸。

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A description is given to construction methods and characteristics of construction management of service gallery and main tunnel.

介绍辅助坑道及正洞的施工方法和施工管理特点。

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But the shut-down schedule also includes upgrades to all four of the LHC's detectors, the shielding of electronics, and even an overhaul of the ventilation system of the tunnel that houses the main accelerator ring.

BBC: LHC switches off for two-year break

Despite a tunnel between Hokkaido and northern Honshu, Japan's main island, connections to the country's industrial heartland are poor.

ECONOMIST: The first of an occasional series on Japan��s economic pains

After his sending off, Wenger was unaware of where to go and firstly moved to the Arsenal dugout and then the main stand at Old Trafford before being ushered along the touchline to the tunnel as the game concluded.

BBC: Wenger to get sending off apology