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| 氮氢混合气体 | |||
| 混合气体 | |||
| 合成气体 | |||
| forming gas: 32 phrases in 10 subjects |
| Animal husbandry | 4 |
| Architecture | 1 |
| Automobiles | 1 |
| Chemistry | 2 |
| Electric machinery | 1 |
| Engineering geology | 1 |
| Environment | 1 |
| Hydroelectric power stations | 2 |
| Metallurgy | 5 |
| Technology | 14 |
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