它们的视网膜细胞对中等亮度光线中的红色成分也不太敏感。
Their retinal cells are also not excessively sensitive to red components of moderately bright light.
调成中等亮度，既能省电又保护视力。
If adjusted on medium. You will save more electricity and protect your eyesight.
因为猎户座是最与众不同的星座之一，它呈一大矩形形状，当中有三颗众成一列、中等亮度的星星。
That's because Orion is one of the sky's most distinctive constellations. It's a large rectangle, with a distinctive row of three medium-bright stars in the middle.
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