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| 残存气; 垫层气; 垫气; 缓冲气 | |||
| cushion gas: 9 phrases in 6 subjects |
| Drilling | 2 |
| Electronics | 1 |
| Metallurgy | 2 |
| Oil / petroleum | 2 |
| Space | 1 |
| Technology | 1 |
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