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| smut; sooty coal | |||
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土煤 : 68 phrases in 9 subjects |
| Architecture | 1 |
| Construction | 2 |
| Electronics | 1 |
| Engineering geology | 6 |
| General | 8 |
| Hydroelectric power stations | 2 |
| Metallurgy | 4 |
| Oil / petroleum | 5 |
| Technology | 39 |
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