n.

a passageway through or under something, usually underground (especially one for trains or cars)

"the tunnel reduced congestion at that intersection"

a hole in the ground made by an animal for shelter

同義詞：burrow

Extensions to RSVP for LSP tunnels
Back analysis of measured displacements of tunnels
Settlements above tunnels in the United Kingdom-their magnitude and prediction
Dynamic routing of bandwidth guaranteed tunnels with restoration
Theory of the propagation of UHF radio waves in coal mine tunnels
Minimum interference routing of bandwidth guaranteed tunnels with MPLS traffic engineering applications
Nicotinic acetylcholine receptor at 4.6 A resolution: transverse tunnels in the channel wall.
PAH source fingerprints for coke ovens, diesel and, gasoline engines, highway tunnels, and wood combustion emissions
MIL-103, a 3-D lanthanide-based metal organic framework with large one-dimensional tunnels and a high surface area
ChemInform Abstract: Reduced Molybdenum Phosphates: Octahedral-Tetrahedral Framework Solids with Tunnels, Cages, and Micropores