I know what it's like to go through the long tunnel of grief and back into the sunlight of hope and life. Perhaps now I can help others do the same.

我知道走过哀伤的漫长路后，重见希望和生命之光的滋味如何，或许，我现在可以帮助别人也这样做。

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How long is the tunnel?

这隧道有多长？

《柯林斯英汉双解大词典》

Background: This 33.5-mile-long rail tunnel links the island of Honshu with the island of Hokkaido.

背景材料：这条33.5英里长的铁路隧道连接北海道与本州岛。

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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。

纽约的交通手段 - SpeakingMax英语口语达人

For Bush and Prana Biotechnology, the new data is a sign that there might be a light at the end of the long tunnel they are slogging through.

FORBES: Rethinking Alzheimer's

The Department of Transport said a sale will only be made to "a public body" able to take on the maintenance of the mile-long tunnel.

BBC: Harecastle tunnel offered for sale by the government

At over a mile long, the Combe Down tunnel will be the longest cycling tunnel in Britain and will feature an interactive light and sound installation.

BBC: Bath's Two Tunnels Greenway cycle path opens