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| 氢氧 | |||
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hydrogen- oxygen : 64 phrases in 16 subjects |
| Automobiles | 2 |
| Aviation | 3 |
| Business | 1 |
| Chemistry | 6 |
| Earth sciences | 2 |
| Ecology | 2 |
| Electronics | 4 |
| General | 4 |
| Geology | 1 |
| Materials science | 1 |
| Metallurgy | 1 |
| Oil processing plants | 1 |
| Scientific | 9 |
| Shipbuilding | 1 |
| Space | 17 |
| Technology | 9 |