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| 51. | CH2ClCH2Cl CH2ClCH2Cl; |
| 对称二氯乙烷 |
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| 52. | symmetric resonator |
| 对称谐振腔 |
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| 53. | mirror symmetry |
| 镜面对称 |
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| 54. | rotational symmetry |
| 轴向对称 |
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| 55. | group symmetries |
| 群对称 |
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| 56. | balancing bushing |
| 对称轴瓦 |
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| 57. | axiom of symmetry |
| 对称公理 |
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| 58. | holohedral symmetry |
| 全对称 |
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| 59. | external symmetry |
| 外对称 |
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| 60. | reverse symmetry |
| 反向对称 |
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