时光让我把我爱的少年忘了
[shí guāng ràng wŏ bă wŏ ài de shăo nián wàng le]
This roughly means 'Time made me forget the young man I love', which evokes an image of a bittersweet or regretful acceptance that love changes over long periods or after going through significant events in life; a kind nostalgia toward lost youthful romance.