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积累度 : 50 phrases in 15 subjects |
| Air defense | 1 |
| Aviation | 1 |
| Bridge construction | 1 |
| Business | 4 |
| China | 1 |
| Desert science | 2 |
| Ecology | 1 |
| Economy | 2 |
| Electronics | 2 |
| International Monetary Fund | 2 |
| Metallurgy | 4 |
| Mining | 1 |
| Securities | 1 |
| Space | 1 |
| Technology | 26 |
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