天未及海宽海未及天蓝
[tiān wèi jí hăi kuān hăi wèi jí tiān lán]
This username compares the width of sky to the sea's broadness and the color of sky with the blue ocean, suggesting that there might always be someone or something far better or unreachable out there. The user might want to express their humble view about the world and themselves as a result.