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多 孔管 : 78 phrases in 16 subjects |
| Agriculture | 2 |
| Automobiles | 1 |
| Chemistry | 1 |
| Desert science | 1 |
| Earth sciences | 1 |
| Ecology | 1 |
| Electronics | 5 |
| Engineering geology | 3 |
| General | 1 |
| Hydroelectric power stations | 3 |
| Metallurgy | 1 |
| Oil / petroleum | 3 |
| Rail transport | 1 |
| Technology | 47 |
| Textile industry | 1 |
| Water resources | 6 |
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