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| 11. | rare stable isotope |
| 稀有稳定同位素 |
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| 12. | rare precious metal |
| 稀有贵金属 |
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| 13. | as scarce as hen's teeth |
| 极其稀有 |
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| 14. | rare and rare earth metal ore deposit |
| 稀有和稀土金属矿床 |
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| 15. | bird watchers on the alert for a rare species; cops were on the job and caught them red-handed. |
| 鸟类学家警惕地看的一个稀有品种；警察们很警惕并且当场抓获了他们。 |
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| 16. | rare soft metal |
| 稀有软质金属 |
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| 17. | scarce currency clause |
| 稀有通货条款 |
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| 18. | A black swan is rare. |
| 黑天鹅很稀有。 |
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| 19. | rare scattered metal |
| 稀有分散金属 |
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| 20. | chemistry of rare radioelements |
| 稀有放射元素化学 |
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