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71. | primitive security |
| 原始证券 |
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72. | original section |
| 原始剖面 |
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73. | original source |
| 原始资料 |
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74. | primitive symbol |
| 原始符号 |
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75. | protoporcelain ware |
| 原始瓷器 |
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76. | primitive money |
| 原始货币 |
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77. | leaf primordium |
| 原始叶 |
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78. | primitive stress |
| 原始应力 |
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79. | primitive glottis |
| 原始声门 |
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80. | primordial ecosystem |
| 原始生态系统 |
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