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31. | Cases of smallpox are becoming rare. |
| 天花病例日益罕见. |
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32. | rare phenomenon |
| 罕见的现象 |
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33. | A thing that is seldom seen |
| 罕见之物 |
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34. | This practice is rare. |
| 这种做法比较罕见。 |
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35. | The milu deer is very rare now. |
| 麋鹿现在很罕见。 |
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36. | A Rare Fossil Record |
| 罕见的化石记录 |
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37. | an uncommon Bird |
| 一只罕见的鸟 |
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38. | Not common;rare. |
| 不寻常的;罕见的 |
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39. | medical curiosity |
| 医学上的罕见病变 |
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40. | "A rare case," he muttered. |
| “一种罕见的病例 |
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