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单词 rainbow
释义 rainbow
An optical phenomenon that appears as an arc of the colours of the spectrum across the sky when falling water droplets are illuminated by sunlight from behind the observer. The colours are produced by the refraction and internal reflection of the sunlight by the water drops. Two bows may be visible, the inner ring being known as the primary bow and the outer, in which the colours are reversed, as the secondary bow (see illustration).

Primary rainbow (one internal reflection)

Secondary rainbow (two internal reflections)
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更新时间:2025/6/23 14:31:58