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| bore | |||
| burrow | |||
| tunnel A underground passageway, especially one for trains or cars that passes under a mountain, river or a congested urban area (地下通道，特别是为火车或汽车穿过山，河流或拥挤的市区而设的。) | |||
| tube; tunnel | |||
| shaft alley (又称隧洞); tunnel (又称隧洞) | |||
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| ISATAP tunneling | |||
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| 6 to 4 tunneling | |||
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| tunnel | |||
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| tunnel | |||
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| tunnel | |||
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| syrinx | |||
| 隧道: 1568 phrases in 60 subjects |