你是我脑海舍不去的珍惜你是我内心抹不掉的回忆
[nĭ shì wŏ năo hăi shè bù qù de zhēn xī nĭ shì wŏ nèi xīn mŏ bù diào de huí yì]
Meaning 'you are an irreplaceable treasure in my mind and an unforgettable memory in my heart', this emphasizes the profound impact a person has had on them emotionally.