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| characteristic spectrum | |||
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特征谱 : 34 phrases in 14 subjects |
| Air defense | 1 |
| Aviation | 1 |
| Chemistry | 1 |
| Construction | 1 |
| Electronics | 2 |
| General | 1 |
| Hydroelectric power stations | 3 |
| Metallurgy | 3 |
| Oil / petroleum | 2 |
| Polymers | 1 |
| Remote sensing | 1 |
| Space | 6 |
| Technology | 10 |
| Telecommunications | 1 |
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