While he was investigating ways to improve the telescope Newton made discovery which pletely changed man’s understanding of color.
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解析：make a discovery 有了一个发现；man’s understanding of color人类对于颜色的理解，在物主代词，名词所有格前，一般不用加冠词，man 用单数形式，前面不加冠词，可以表示“人类”。