 |
| |||
| subterranean railroad; metro | |||
| mass-rapid-transit MRT | |||
| underground (railway) | |||
| tube railroad; tube railway | |||
| subway; tube; underground railroad | |||
| underground; underground railway | |||
| deep-tube railway; low-level railway; subterranean railway; transit tube; tubed railway; underpass | |||
| Untergrundbahn | |||
| |||
| subway | |||
| |||
| U-bahn | |||
| |||
| tube | |||
| 地下铁道: 39 phrases in 7 subjects |
| Architecture | 1 |
| Bridge construction | 1 |
| Earth sciences | 1 |
| General | 1 |
| Hydroelectric power stations | 2 |
| Metallurgy | 1 |
| Technology | 32 |