 |
| |||
| пещера; подземная пустота | |||
| underground cavern: 17 phrases in 5 subjects |
| Natural resourses and wildlife conservation | 1 |
| Oil / petroleum | 7 |
| Oil and gas | 4 |
| Oilfields | 4 |
| Technology | 1 |
|
| |||
| пещера; подземная пустота | |||
| underground cavern: 17 phrases in 5 subjects |
| Natural resourses and wildlife conservation | 1 |
| Oil / petroleum | 7 |
| Oil and gas | 4 |
| Oilfields | 4 |
| Technology | 1 |