少年的泪不及海天蓝
[shăo nián de lèi bù jí hăi tiān lán]
This means 'The tears of youth do not reach the blue of the sea and sky.' It expresses a kind of melancholy about young people, usually teenagers, who feel their pain, as symbolized by their tears, pales compared to other larger, vaster things in this world like the sky or the ocean.