B2 an arch (= curved shape) of different colours seen in the sky when rain is falling and the sun is shining彩虹,虹
More examples
Look over there - there's a rainbow!
The glass prism refracted the white light into the colours of the rainbow.
The colours of the spectrum - red, orange, yellow, green, blue, indigo and violet - can be seen in a rainbow.
She did a stencil of a rainbow on her daughter's bedroom wall.
There's a double rainbow!
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