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21. | rare - earth element |
| 【化】稀土元素 |
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22. | heavy rare earths |
| 重稀土 |
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23. | A rare talent |
| 不世之才 |
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24. | a rare event |
| 罕见的事件 |
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25. | rare gas clathrate |
| 稀有气体笼形包合物 |
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26. | a rare mineral |
| 稀有矿物 |
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27. | a rare steak |
| 鲜嫩的牛排 |
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28. | magnesium-rare earth |
| 稀土镁合金 |
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29. | infinitely rare medium |
| 无限稀薄介质 |
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30. | rare earth addition |
| 稀土添加剂 |
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