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单词 circumhorizontal arc
释义

circumhorizontal arc

noun

cir·​cum·​horizontal arc
: a colored halo of 90° extent or less that is red on the upper side, parallel to the horizon and 46° or a little more below the sun, and produced by the refraction of light across 90° angles at the undersides of ice crystals in suspension in the air
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更新时间:2026/6/7 23:34:56