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这是因为自然界无法制造产生蓝色色素。
This is because nature is unable to produce blue pigments.
youdao
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它是一类可溶性的色素，颜色从蓝色一直到红色。
It is a kind of soluble pigment, the color from blue through to red.
youdao
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它是一类可溶性的色素，颜色从蓝色一直到红色。
It is a kind of soluble pigment, the color from blue through to red.
youdao