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| underground railway An electric passenger railway operated in underground tunnels (在地下隧道运行的电动客运铁路。) | |||
| underground railroad | |||
| subterranean railway | |||
| tube railway; underpass | |||
| 地 下 铁路: 4 phrases in 2 subjects |
| Engineering geology | 1 |
| Technology | 3 |
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