But the Thames tunnel is ahistorical milestone in tunnel engineering.

但是，泰晤士河隧道是隧道工程历史上的一座里程碑。

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In tunnel mode, the inner IP header carries the intended source and original destination addresses, while an outer IP header contains IP addresses for hop points such as security gateways.

在隧道模式，内部的ip报头承载预设的源和最初的目的地址，外部ip报头包含用于跳点的IP地址，比如安全网关。

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When the two ends of the tunnel met in the middle they were only a few inches out.

隧道两端在中间相接时，只有几英寸的误差。

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As you stand inside the tunnel, you see the video images reflected many times in the mirrors.

VOA: special.2009.03.11

When you start describing the significance of a symbol like the tunnel, which recurs in the book, you immediately begin to limit it, and a symbol should go on deepening.

当你开始描述一个象征的意义,比如说在书中，反复出现的隧道，当你一开始予以限制，这个象征就会继续深化。

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Sometime it will just stop in the middle of a tunnel for however long.

有时候，地铁会久久地停在隧道的中间。

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Some of the larger rapid transit systems have a more interconnected web of tracks and tunnels, so if maintenance is happening in one tunnel, the trains can be rerouted in a different tunnel (for example, NY MTA).

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The deadliest tunnel-fire incidents happened in 2001 in the 16.9 kilometer-long (10.5 miles) Gotthard tunnel when a crash involving two trucks caused a fire in the tunnel, killing 11 people.

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The centres under threat are Crofts Corner in Bretton, the Tunnel in Orton Malborne, Charteris in Welland, Chestnuts in Eastfield, the Spinney in Ravensthorpe, Thistle Drive in Stanground and the Peterborough Adventure Playcentre in Paston.

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