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| 51. | planetarium projector |
| 天象仪 |
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| 52. | animatic projector |
| 字幕放映 |
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| 53. | projector comparator |
| 投影比较仪 |
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| 54. | orthogonal projector |
| 正交射影算子 |
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| 55. | oblique projector |
| 倾斜投影器 |
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| 56. | schlieren projector |
| 纹影投影机 |
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| 57. | xenon projector |
| 氙放映机 |
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| 58. | marking projector |
| 光学号料投影器 |
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| 59. | sonar projector |
| 声呐发射器 |
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| 60. | projector efficiency |
| 投影机效率 |
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