浅鱼深海
[qiăn yú shēn hăi]
Translated loosely, 'Shallow Fish in Deep Sea' might suggest humility ('I know little compared to vast knowledge'), longing ('Fish wishes for deep sea but remains shallow') or a contrast (being different in nature between two worlds). A fish normally swims in shallow seas whereas deep sea represents more unknowns or unattained depth and breadth.