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| 71. | cyclic symmetry |
| 循环对称 |
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| 72. | symmetrical transistor |
| 对称晶体管 |
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| 73. | symmetrical wave |
| 对称波 |
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| 74. | quartic symmetry |
| 四次对称 |
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| 75. | symmetry circuit |
| 对称电路 |
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| 76. | circle of symmetry |
| 对称圆 |
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| 77. | symmetry classes |
| 对称类 |
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| 78. | crossing symmetry |
| 交叉对称 |
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| 79. | symmetry potentia |
| 对称势 |
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| 80. | quadrantal symmetry |
| 象限对称 |
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