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| 煤矿区 | |||
| 煤田 | |||
| 煤矿床 | |||
| 煤炭田; 产煤区 | |||
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| 煤田; 煤矿区; 产煤区 | |||
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| 煤田 | |||
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coal- field : 13 phrases in 5 subjects |
| Business | 1 |
| Desert science | 1 |
| Earth sciences | 1 |
| Oil / petroleum | 1 |
| Technology | 9 |
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