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| 小扰动方程 | |||
| 小干扰波动 | |||
| 小扰动 | |||
| small perturbation: 15 phrases in 6 subjects |
| Air defense | 1 |
| Aviation | 1 |
| Business | 1 |
| Electronics | 3 |
| Rail transport | 4 |
| Space | 5 |
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