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| 11. | rare scattered metal |
| 稀有分散金属 |
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| 12. | rare amino acid |
| 稀有氨基酸 |
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| 13. | rare light metal |
| 稀有轻金属 |
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| 14. | rare stable isotope |
| 稀有稳定同位素 |
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| 15. | rare precious metal |
| 稀有贵金属 |
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| 16. | scarce currency clause |
| 稀有通货条款 |
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| 17. | as scarce as hen's teeth |
| 极其稀有 |
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| 18. | rare soft metal |
| 稀有软质金属 |
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| 19. | In course of sinking the well - shaft they came upon a deposit of a very rare mineral. |
| 在把钻杆插入井下的过程中，他们意外地发现了一种稀有矿物的矿床。 |
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| 20. | A black swan is rare. |
| 黑天鹅很稀有。 |
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