一种颜色的彩虹
[yī zhŏng yán sè de căi hóng]
'Yi Zhong Yan Se De Cai Hong' translates as 'A Rainbow in One Color'. Rainbows typically consist of multiple colors, so this phrase conveys the unique beauty and purity despite limitations or challenges - perhaps highlighting a particular preference or viewpoint in the eyes of beholder or simply a longing for singularity in complicated world.