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81. | symmetric array |
| 对称组合 |
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82. | cyclic symmetry |
| 循环对称 |
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83. | crossing symmetry |
| 交叉对称 |
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84. | symmetric cycle |
| 对称循环 |
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85. | quartic symmetry |
| 四次对称 |
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86. | synapsis symmetrica |
| 对称突触 |
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87. | quadrantal symmetry |
| 象限对称 |
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88. | symmetric construction |
| 对称结构 |
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89. | axial plane of symmetry |
| 对称轴面 |
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90. | symmetric graph |
| 对称图 |
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