The structure of tunnel form building is a more popular structural system in European.

模 房屋结构在欧洲是一种比较流行的结构体系。

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Small clearance tunnel is a tunnel form between separated tunnel and multi-arch tunnel. It is much easier to construct, waterproof and control the cost.

小净距隧道是介于分离式隧道和连拱隧道之间的隧道结构形式，该结构形式比连拱隧道施工工艺更简单，且易于防水处理和造价控制。

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You can also use SSH to tunnel in, or connect to your local system from the outside world. This is the general form of an inbound tunnel.

也可以使用SSH发送进来，或者从外部世界连接到您的本地系统。

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Devonshire railway tunnel at Bloomfield will also form part of the new Two Tunnels Greenway route, which runs through Linear Park and over the Tucking Mill Viaduct.

BBC: Combe Down tunnel has light and sound display installed

Economists in Thailand suggest reviving plans for a gargantuan construction project digging a hole through the isthmus in southern Thailand (not quite pure Keynes: the hole would not be filled in, but form a canal tunnel linking the Pacific and Indian oceans).

ECONOMIST: Still sick and gloomy, now rebellious

Technically speaking, the particular challenge for Tioni is the curved bottom form that's made with a tire tunnel.

WSJ: Luxury Trunks, Reinvented