
Tunnel
Physical Structures
Used to describe structures allowing transportation through obstacles.

The new tunnel connects two major cities.
Metaphorical Use
Sometimes 'tunnel' may represent a challenge or journey in life.

He's going through a dark tunnel, but he'll emerge stronger.
Not Always Underground
Tunnels can be above ground, like wildlife crossings over highways.

The wildlife tunnel helps animals cross safely.
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BoreChannelConduitHolePassagePipelineShaftTube
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