幻日是阳光通过云层中微小冰晶的折射而造成的另一种大气光学现象。
A sundog is another atmospheric optical phenomenon caused by the refraction of sunlight by tiny ice crystals in clouds.
冰晶必须面向水平，而观察者的视线也必须接近水平来观察幻日。
The ice crystals must be oriented horizontally and the observer's line of sight must be close to horizontal to see the sundogs.
幻日是一种罕见的光学现象。
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