【上位】 (physics) electromagnetic radiation that can produce a visual sensation; "the light was filtered through a soft glass window" 視覚の感覚を生じさせる電磁放射。
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【上位】 the quality of being luminous; emitting or reflecting light; "its luminosity is measured relative to that of our sun" 光を発する性質。光を放つ、または反射すること。
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