白天不懂夜的黑夜不懂白天的白
[bái tiān bù dŏng yè de hēi yè bù dŏng bái tiān de bái]
A complex expression suggesting a mutual incomprehension between different states or identities, much like daytime cannot understand nighttime or vice versa. It might hint at contrasts or misunderstandings between different aspects of life, people, or situations.