白天不懂夜的黑咖啡不懂酒的醉
[bái tiān bù dŏng yè de hēi kā fēi bù dŏng jiŭ de zuì]
'Day Does Not Understand Night's Blackness And Coffee Does Not Understand Drunkenness Of Wine'. Using the contrast between coffee and alcohol (daytime stimulant vs night-time depressant), it describes situations or people who cannot understand each other because of inherent differences in perspective.