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对称 轴 : 275 phrases in 24 subjects |
| Agriculture | 14 |
| Architecture | 4 |
| Automobiles | 4 |
| Aviation | 20 |
| Bridge construction | 6 |
| Chemistry | 5 |
| Compressors | 1 |
| Electronics | 6 |
| Engineering geology | 7 |
| Explosives and Explosive Ordnance Disposal | 2 |
| General | 10 |
| Geophysics | 3 |
| Hydroelectric power stations | 7 |
| Medical | 1 |
| Metallurgy | 17 |
| Mining | 1 |
| Nautical | 1 |
| Oil / petroleum | 12 |
| Plastics | 5 |
| Reproductive biology | 4 |
| Space | 19 |
| Technology | 115 |
| Thermal Energy | 1 |
| Wind Energy | 10 |
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