He wrote textbooks on heat, mathematics, color vision and physics.
他撰写有关热、数学、色觉和物理学的教科书。
From physics' views, how many different wavelengths, so how many kinds of color.
从物理学的观点来看，不同的波长有多少种，颜色就有多少种。
From physics' views, how many different wavelengths, so how many kinds of color.
从物理学的观点来看，不同的波长有多少种，颜色就有多少种。
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