海水看不见鱼的眼泪鱼听不见海水的叹息
[hăi shuĭ kàn bù jiàn yú de yăn lèi yú tīng bù jiàn hăi shuĭ de tàn xī]
An eloquent phrase illustrating deep hidden sorrow: 'Seawater can't see the fish's tears, and fish can't hear the seawater sigh.' It metaphorically describes invisible grief or silent pain between entities that exist side by side yet remain unknowing of each other’s suffering.