fogdog

詳細解釋：

fog.dog

n.（名詞）
A bright or clear spot that appears in breaking fog.
霧虹：霧堤中有時可見的明亮部分

來源：
[From the fact that it accompanies fog as a dog accompanies its owner]
[從彩虹總是與霧同現就象一條狗陪伴其主人的事實中得來]