深海深不可及远路远不可及
[shēn hăi shēn bù kĕ jí yuăn lù yuăn bù kĕ jí]
This poetic phrase translates to 'as unreachable as the depth of the ocean and the distance of far road' signifying something unattainable, emphasizing depth and remoteness in various metaphorical contexts such as love, journey or goals.