雨水冲淡了的悲伤
[yŭ shuĭ chōng dàn le de bēi shāng]
'Sadness washed away by rain.' This suggests melancholic feelings diluted by time, symbolized by rain – which in various cultures often symbolizes cleansing or purification. So it could imply moving on after grief or hardships. It reflects introspection and poetic sentiment.