喷漆、油漆类术语 ... luminance factor 特定辉度比 luminance level 亮（度）级 luminance purity 亮度纯度 ...
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他们还选择了超过1200个不活跃的星系，它们的距离和亮级都相同，这样可以保证图像的质量相同。
They then chose more than 1,200 inactive galaxies at the same distance and brightness levels to ensure all images were of the same quality.
华北地台北缘亮甲山组地层中发育有六种碳酸盐米级旋四层序；
Six types of the metre-scale carbonate cycles are recognized in the Ordovician Liangjiashan Formation on northern North China platform.
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