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| 81. | rare-earth chelate |
| 螯合稀土金属 |
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| 82. | rare earth minera |
| 稀土矿物 |
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| 83. | rare earth orthoferrite |
| 稀土正铁氧体 |
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| 84. | rare earth dopant |
| 稀土掺杂剂 |
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| 85. | rare earth semiconductor |
| 稀土半导体 |
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| 86. | rare-acid water |
| 微酸水 |
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| 87. | rare gas configuration |
| 稀有气体构形 |
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| 88. | radioactive rare metal |
| 放射性稀有金属 |
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| 89. | rare gas plasma |
| 稀薄气体等离子体 |
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| 90. | rare earth metals |
| 稀土金属 |
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