| |||
coal-field | |||
coal field | |||
basin | |||
coal deposits | |||
coal fields | |||
coalfield | |||
coal basin; coal deposit | |||
| |||
coalfield |
煤田: 78 phrases in 7 subjects |
Desert science | 1 |
Earth sciences | 6 |
Explosives and Explosive Ordnance Disposal | 23 |
General | 1 |
Geophysics | 1 |
Oil / petroleum | 3 |
Technology | 43 |