深海不见鱼的心浅滩不见海的影
[shēn hăi bù jiàn yú de xīn qiăn tān bù jiàn hăi de yĭng]
'In the deep sea where fish can't see hearts, in shallow waters where the sea leaves no reflection.' A metaphor for unseen emotions in deep connections versus fleeting impressions on the surface.