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| bottom layer | |||
| 底部 层: 51 phrases in 13 subjects |
| Agriculture | 1 |
| Earth sciences | 2 |
| Electronics | 8 |
| Engineering geology | 2 |
| Explosives and Explosive Ordnance Disposal | 3 |
| General | 2 |
| Geology | 1 |
| Geophysics | 2 |
| Metallurgy | 2 |
| Oil / petroleum | 5 |
| Plastics | 1 |
| Space | 2 |
| Technology | 20 |