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| caving of the roof | |||
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| overhead caving | |||
| 放 顶: 47 phrases in 12 subjects |
| Animal husbandry | 7 |
| Automobiles | 2 |
| Business | 1 |
| Chemistry | 1 |
| Electronics | 1 |
| Explosives and Explosive Ordnance Disposal | 19 |
| Fashion | 1 |
| General | 1 |
| Logistics | 1 |
| Metallurgy | 4 |
| Oil / petroleum | 1 |
| Technology | 8 |
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