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1.The photon exitance of the light source is crucial for the accuracy of the measurement.
光源的光子发射率对于测量的准确性至关重要。
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2. The experiment was designed to measure the photon exitance of the light source.
这个实验旨在测量光源的光子发射率。
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3. The study found that the photon exitance of the light source had increased by 5% over the past year.
研究发现，过去一年中，光源的光子发射率增加了5%。