a curved band of different colours that appears in the sky when the sun shines through rain 虹；彩虹 all the colours of the rainbow 彩虹的各种颜色
Extra ExamplesTopics Weatherc1- (figurative)
Every year the Dutch bulb fields burst into a rainbow of colours. 每年荷兰的灯泡田都变成彩虹。 - (figurative)
A rainbow of medals decorated his chest. 五颜六色的勋章挂满他的胸前。
Oxford Collocations DictionaryRainbow is used before these nouns:- coalition
Word OriginOld English regnboga (see rain, bow2).