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| 81. | primitive cortex |
| 原始皮质 |
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| 82. | primordial ovum |
| 原始卵细胞 |
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| 83. | primary ore deposit |
| 原始矿藏 |
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| 84. | original document | original bill |
| 原始单据 |
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| 85. | primary pigment |
| 原始色素 |
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| 86. | primitive black hole |
| 原始黑洞 |
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| 87. | primary radionuclides |
| 原始放射性核素 |
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| 88. | original austenite |
| 原始奥氏体 |
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| 89. | primitive atmosphere |
| 原始大气圈 |
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| 90. | original ground |
| 原始根据 |
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