 |
| |||
| coal-mining (bookworm); mining operations; coal extraction | |||
| coal extraction | |||
| coal output; coal production | |||
| coal mining | |||
|
угледобыча : 2 短语, 2 学科 |
| 地质学 | 1 |
| 煤炭 | 1 |
|
| |||
| coal-mining (bookworm); mining operations; coal extraction | |||
| coal extraction | |||
| coal output; coal production | |||
| coal mining | |||
|
угледобыча : 2 短语, 2 学科 |
| 地质学 | 1 |
| 煤炭 | 1 |