| 释义 |
cir·cum·horizontal arc
\| ̷ ̷ ̷ ̷+..-\ noun
: 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 |