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| 固定气体 (在常压和常温下不冷凝的气体) | |||
| 非反应柱气体; 固定气 | |||
| 恒定气体 | |||
| 固定气体; 难于凝聚的气体; 不凝气 | |||
| fixed gas: 6 phrases in 3 subjects |
| Nautical | 4 |
| Space | 1 |
| Technology | 1 |
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