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21. | projection density |
| 投影密度 |
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22. | tricolor projection |
| 三色投影 |
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23. | Projection display |
| 投影显示 |
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24. | top projection |
| 顶面投影 |
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25. | superfluous view |
| 多余投影 |
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26. | projecting figure |
| 投影图形 |
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27. | elliptical projectio |
| 椭圆投影 |
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28. | projection exposure |
| 投影曝光 |
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29. | double projection |
| 双重投影 |
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30. | natural projection |
| 自然投影 |
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