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61. | symmetrical factor |
| 对称因子 |
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62. | symmetric space |
| 对称空间 |
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63. | symmetrical adjustment |
| 对称蝶 |
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64. | symmetrical load |
| 对称荷载 |
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65. | symmetrical banding |
| 对称条带 |
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66. | symmetrical electrometer |
| 对称静电计 |
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67. | symmetrical beam |
| 对称束 |
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68. | symmetrical lens |
| 对称透镜 |
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69. | symmetrical correspondence |
| 对称对应 |
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70. | symmetrical mirror |
| 对称镜 |
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