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31. | Are you allergic to certain animals? |
| 你讨厌某些动物吗? |
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32. | certain inorganic ions in cells |
| 细胞中某些无机离子 |
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33. | Not valid on certain trains. |
| 车票对某些列车无效 |
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34. | signals with certain fixed meanings |
| 代表某些固定意义的信号. |
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35. | Certain stations are closed on public holidays |
| 假日某些车站关闭 |
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36. | The president of certain american universities. |
| 美国某些大学的校长. |
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37. | Certain banknotes have been called in. |
| 某些钞票已停止流通。 |
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38. | outlaw certain addictive drugs |
| 宣布某些致瘾药物为禁品. |
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39. | The Perils of Certain English Prisoners |
| 某些英国犯人的险境 |
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40. | The government excludes certain immigrants. |
| 该政府不许某些移民入境。 |
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