The calculated result from an example shows that the stable sectional area reduces with the increase of working head, or the decrease of the tailrace tunnel length.

计算结果表明，尾水调压室断面面积随水轮机工作水头的增大或尾水洞长度的缩短而减小。

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Additionally, its33.5-mile length makes it the longest tunnel currently in use.

此外，其33.5英里的长度使其成为目前使用中最长的隧道。

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This big tunnel with the length of 505 meters is the most magnificent part of that complex.

505米长的这条大隧道是那个综合体最宏伟的部分。

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First conceived nearly one-hundred years ago during the reign of Russian Tsar Nicolas II, the BST would be the longest tunnel in the world - over twice the length of Europe's 30 mile long "Chunnel" linking Britain and France.

CENTERFORSECURITYPOLICY: The Bering Strait Tunnel Project

Officials do not say whether this would involve a tunnel or a bridge, but at around 100km in length, either would be the longest of its type in the world.

ECONOMIST: Grand plans for a jointly run island