1
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tunnel
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United States
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Tunnels are frequently utilized for transportation in urban areas and are linked with modern infrastructure projects in the United States.
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6
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2
|
tunnel
|
Austria
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Tunnel construction is crucial for efficient transportation through Austria's mountainous terrain.
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2
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3
|
tunnel
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European countries
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European countries commonly use tunnels for transportation and storage, including wine cellars, extending for long distances.
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2
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4
|
tunnel
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Arab countries
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Tunnels in Arab countries are often associated with water management and ancient dwellings.
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1
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5
|
tunnel
|
industrialized countries
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Tunnels are frequently utilized for transportation in industrialized countries to alleviate urban traffic congestion.
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1
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6
|
tunnel
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less-industrialized countries
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Tunnels in less-industrialized countries are primarily used for mining and underground water systems rather than urban transportation.
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1
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7
|
tunnel
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rural
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Tunnels in rural areas are less common and are primarily associated with mining or underground water systems.
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1
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8
|
tunnel
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urban
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Tunnels are urban transportation solutions for easing traffic congestion.
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1
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