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1. | rare light metal |
| 稀有轻金属 |
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2. | unique transition |
| 稀有跃迁 |
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3. | a rare mineral |
| 稀有矿物 |
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4. | as scarce as hen's teeth |
| 极其稀有 |
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5. | private antigen |
| 稀有抗原 |
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6. | rare amino acid |
| 稀有氨基酸 |
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7. | scarce currency |
| 稀有通货 |
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8. | rare precious metal |
| 稀有贵金属 |
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9. | rare alkaline earth meta |
| 稀有碱土金属 |
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10. | scarce currency clause |
| 稀有通货条款 |
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