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| oxygen breathing apparatus | |||
| oxygen inhaler | |||
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吸氧器 : 24 phrases in 12 subjects |
| Animal husbandry | 1 |
| Automobiles | 1 |
| Aviation | 1 |
| Chemistry | 1 |
| Ecology | 2 |
| General | 2 |
| Metallurgy | 3 |
| Nautical | 1 |
| Sports | 2 |
| Surgery | 1 |
| Technology | 8 |
| Water resources | 1 |
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