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81. | age characteristics |
| 年龄特征 |
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82. | gestational age |
| 孕龄 |
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83. | preponderant age |
| 主要年龄 |
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84. | age stratification |
| 年龄分层 |
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85. | fertilization age |
| 受精龄 |
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86. | Golden age |
| 黄金时代 |
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87. | Chalcolithic Age |
| 石器-青铜时代 |
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88. | age replacement |
| 年龄置换 |
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89. | conventional age |
| 常规年龄 |
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90. | arithmetical age |
| 算术年龄 |
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