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Results:
optical purity : 1）光学純度
optical path : 1）光路
optical art : 1）=op art
optical density : 1）光学濃度 2）光学密度 3）吸光度
optical activity : 1）光学活性
optical aiming : 1）光学的照準
optical axis : 1）光軸
optical disk : 1）光ディスク
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optical purity

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