暗度是温度与波长的函数。
The opacity is a function of temperature and wavelength .
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The opacity is a function of temperature and wavelength.
光阴似水，流年暗度。
Time like water, fleeting darkness.
对比度—一个图片上亮到暗区域的变化范围。
CONTRAST - the range of difference in the light to dark areas of an image.
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