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| 51. | rare earth chemistry |
| 稀土化学 |
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| 52. | on rare occasions |
| 难得，偶然 |
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| 53. | a rare friend |
| 极好的朋友 |
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| 54. | rare earth oxide |
| 氧化稀土 |
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| 55. | rare; very few |
| 寥寥无几 |
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| 56. | rare earth catalyst |
| 稀土催化剂 |
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| 57. | rare delicacies; dainties |
| 珍羞 |
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| 58. | rare earth nuclei |
| 稀土核 |
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| 59. | rare earth betafite |
| 稀土贝塔石 |
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| 60. | rare light metal |
| 稀有轻金属 |
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