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| 21. | chemistry of rare radioelements |
| 稀有放射元素化学 |
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| 22. | rare scattered metal |
| 稀有分散金属 |
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| 23. | rare soft metal |
| 稀有软质金属 |
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| 24. | It also has some rare collections. |
| 还有些稀有收藏品。 |
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| 25. | rare stable isotope |
| 稀有稳定同位素 |
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| 26. | rare and rare earth metal ore deposit |
| 稀有和稀土金属矿床 |
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| 27. | A black swan is rare. |
| 黑天鹅很稀有。 |
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| 28. | Endangered Species Advisory Committee |
| 保护稀有动植物咨询委员会 |
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| 29. | the feathered tribe |
| 鸟类 |
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| 30. | A bird whose feet are adapted for perching. |
| 栖木鸟类脚爪适于栖息的鸟类 |
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