give me some few sentences about
level crossing
tunnel
bridges
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Explanation:
A tunnel is an underground passageway, dug through the surrounding soil/earth/rock and enclosed except for entrance and exit, commonly at each end. A pipeline is not a tunnel, though some recent tunnels have used immersed tube construction techniques rather than
traditional tunnel boring methods
The train goes through a tunnel in the mountain.
A level crossing is an intersection where a railway line crosses a road or path, or in rare situations an airport runway, at the same
A CRH380A train passing Shoupakou level crossing at Beijing, China
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