咖啡不懂酒的醉白天不懂夜的黑
[kā fēi bù dŏng jiŭ de zuì bái tiān bù dŏng yè de hēi]
Coffee doesn’t understand wine’s drunkenness, just as day cannot comprehend night’s darkness. This compares the difference in emotions or states, emphasizing lack of understanding between contrasting entities.