|
underground structure : 14 phrases in 9 subjects |
| Astronautics | 1 |
| Construction | 3 |
| Energy industry | 1 |
| Geology | 1 |
| Makarov | 3 |
| Mining | 1 |
| Oil and gas | 1 |
| Rail transport | 2 |
| Technology | 1 |
|
underground structure : 14 phrases in 9 subjects |
| Astronautics | 1 |
| Construction | 3 |
| Energy industry | 1 |
| Geology | 1 |
| Makarov | 3 |
| Mining | 1 |
| Oil and gas | 1 |
| Rail transport | 2 |
| Technology | 1 |