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谱特性 : 51 phrases in 14 subjects |
| Agriculture | 2 |
| Air defense | 4 |
| Automobiles | 1 |
| Aviation | 1 |
| Chemistry | 2 |
| Earth sciences | 2 |
| Electronics | 4 |
| Geophysics | 1 |
| Information technology | 1 |
| Oil / petroleum | 4 |
| Plastics | 1 |
| Rail transport | 3 |
| Space | 7 |
| Technology | 18 |
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