黎明前邂逅相遇黄昏后形同陌路
[lí míng qián xiè hòu xiāng yù huáng hūn hòu xíng tóng mò lù]
This phrase means 'met by chance before dawn, strangers again at dusk.' It expresses a poignant sentiment of fleeting encounters and the transient nature of connections in life.