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| 微扰方程 | |||
| 摄动方程; 扰动方程 | |||
| 干扰方程; 摄动法方程式 | |||
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perturbation equation : 6 phrases in 4 subjects |
| Aviation | 2 |
| Chemistry | 1 |
| Rail transport | 1 |
| Space | 2 |
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