碧海蓝天我的少年碧海蓝天我的少女
[bì hăi lán tiān wŏ de shăo nián bì hăi lán tiān wŏ de shăo nǚ]
Literally translating to 'Blue sea and blue sky, my boy; blue sea and blue sky, my girl,' it evokes a nostalgic longing for the simplicity and beauty of youth spent under open skies and serene seas.