你永远不懂我伤悲像白天不懂夜的黑
[nĭ yŏng yuăn bù dŏng wŏ shāng bēi xiàng bái tiān bù dŏng yè de hēi]
'You can never understand my sorrow just like daytime cannot understand night’s darkness' implies deep sadness that others are unable to fully comprehend, highlighting emotional complexity.