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

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