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51. | symmetrical phase |
| 对称相 |
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52. | symmetrical forging |
| 轴对称锻造 |
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53. | symmetrical formulation |
| 对称表示法 |
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54. | symmetrical accelerator |
| 对称加速器 |
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55. | symmetrical fret |
| 对称回纹饰 |
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56. | symmetrical missile |
| 对称形导弹 |
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57. | symmetrical limiting |
| 对称限幅 |
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58. | symmetrical relations |
| 对称关系 |
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59. | symmetrical minor |
| 对称子式 |
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60. | symmetrical amplifier |
| 对称放大器 |
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