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结构优 化 : 39 phrases in 15 subjects |
| Agriculture | 2 |
| Aviation | 3 |
| Bridge construction | 1 |
| Business | 3 |
| China | 2 |
| Commerce | 1 |
| Ecology | 2 |
| Economy | 1 |
| Electronics | 3 |
| Engineering geology | 1 |
| Finances | 9 |
| Metallurgy | 1 |
| Securities | 2 |
| Space | 2 |
| Technology | 6 |
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