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31. | slide projector |
| 幻灯放映机 |
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32. | optical projector |
| 投影系统;光学投影机;光学投影仪 |
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33. | orthogonal projector |
| 正交射影算子 |
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34. | monochrome projector |
| 黑白投影机 |
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35. | projector efficiency |
| 投影机效率 |
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36. | split projector |
| 分裂式发射器 |
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37. | projector Heiou |
| 海鸥幻灯机 |
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38. | microscopic projector |
| 显微投影仪 |
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39. | overhead projector |
| 高架投影机 |
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40. | background projector |
| 背景放映机 |
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