词典释义：
an arch of colours formed in the sky in certain circumstances, and caused by the refraction and dispersion of the sun's light by rain or other water droplets in the atmosphere. The colours of the rainbow are generally said to be red, orange, yellow, green, blue, indigo, and violet.
彩虹。
any display of the colours of the spectrum produced by dispersion of light
五彩缤纷的展示。
a wide range or variety of related and typically colourful things
众多花色品种；五颜六色的组合；五花八门的聚合
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a rainbow of medals decorated his chest .五颜六色的勋章挂满他的胸前。
[as modifier]manycoloured
多种颜色的，五彩缤纷的
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a big rainbow packet of felt pens .一大包五颜六色的粗头水笔。
short for
<Bold>RAINBOW TROUT</Bold>的简称。
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at the end of the rainbow used to refer to something much sought after but impossible to attain 在可望而不可即的地方 -
［ORIGIN with allusion to the story of a crock of gold supposedly to be found by anyone reaching the end of a rainbow．］
chase rainbows （或a rainbow ） pursue an illusory goal 做白日梦，幻想，追寻彩虹
"Old English
