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| 火线: 512 phrases in 37 subjects |
| Agriculture | 4 |
| Animal husbandry | 1 |
| Architecture | 7 |
| Automobiles | 100 |
| Aviation | 10 |
| Bridge construction | 1 |
| Business | 3 |
| Chemistry | 2 |
| Drilling | 1 |
| Earth sciences | 2 |
| Electric machinery | 3 |
| Electronics | 17 |
| Engineering geology | 1 |
| Environment | 2 |
| Exhibitions | 1 |
| Explosives and Explosive Ordnance Disposal | 31 |
| Forestry | 5 |
| General | 34 |
| Geology | 1 |
| Geophysics | 1 |
| Horticulture | 1 |
| Hydroelectric power stations | 4 |
| Latin | 1 |
| Life sciences | 1 |
| Metallurgy | 69 |
| Military | 1 |
| Nursing | 1 |
| Oil / petroleum | 11 |
| Racing and motorsport | 1 |
| Rail transport | 1 |
| Shipbuilding | 3 |
| Space | 17 |
| Steel production | 3 |
| Technology | 166 |
| Telecommunications | 3 |
| United Nations | 1 |
| Wind Energy | 1 |
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