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| 21. | source of parallel light |
| 平行光源 |
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| 22. | primary light source |
| 一次光源 |
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| 23. | standby power source |
| 备用光源 |
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| 24. | non-uniform source aggregate |
| 不均匀光源 |
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| 25. | blue light source |
| 蓝光源 |
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| 26. | short duration light source |
| 短时光源 |
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| 27. | ultraviolet light source |
| 紫外光源 |
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| 28. | point-source of light |
| 点光源 |
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| 29. | A source of light, as a candle. |
| 光源光源，如蜡烛 |
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| 30. | self-emitting light source |
| 自发光源 |
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