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31. | preparatory courses |
| 预备科目 |
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32. | prone-firing when ready |
| 卧射预备 |
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33. | backup aircraft |
| 预备机 |
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34. | preliminary seedling |
| 预备苗 |
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35. | Standing forces |
| 预备部队 |
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36. | Preparative Experiment |
| 预备实验 |
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37. | reserved instruction |
| 预备代码 |
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38. | preparatory interval |
| 预备间隔 |
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39. | criminal preparations |
| 犯罪预备 |
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40. | warming up experience |
| 预备体验 |
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