轻风拂柳淡不了回忆细雨袭面忘不了曾经
[qīng fēng fú liŭ dàn bù le huí yì xì yŭ xí miàn wàng bù le céng jīng]
It literally means 'gentle breezes brushing against willows can't dim the memories; light rain touching the face cannot erase the past’. It conveys the idea that no matter how time passes or changes occur, past experiences remain indelible.