Like a rainbow, its daylight equivalent, a moonbow is produced when light is broken up into its constituent colours as it passes through water droplets.
月虹与白天出现的彩虹一样，是光通过水滴分解成多种色光后产生的，而光本身是由多种色光组成的。
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"The rainbow bridge is broken," joked one Facebook user, while another person asked: "is this a case of Monday Rainbows?"