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| 41. | symmetrical diaphragm |
| 对称膜片 |
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| 42. | symmetrical phase |
| 对称相 |
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| 43. | symmetrical relations |
| 对称关系 |
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| 44. | symmetrical flight |
| 对称飞行 |
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| 45. | symmetrical accelerator |
| 对称加速器 |
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| 46. | symmetrical determinant |
| 对称行列式 |
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| 47. | symmetrical amplifier |
| 对称放大器 |
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| 48. | symmetrical equations |
| 对称方程组 |
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| 49. | symmetrical compound |
| 对称化合物 |
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| 50. | symmetrical flow |
| 对称流 |
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