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Results:
optical path length : 1）光路長
optical length : 1）光路長
optical path : 1）光路
optical theorem : 1）光学定理
optical aiming : 1）光学的照準
optical material : 1）光学材料
optical path difference : 1）光路差
optical axes : 1）《複》光軸
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optical path length

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