想念已成习惯想念已成自然
[xiăng niàn yĭ chéng xí guàn xiăng niàn yĭ chéng zì rán]
'Missing has become habitual, missing has become natural.' It suggests a state where longing or remembering a certain person or scene has become a subconscious routine, expressing deep emotional ties or affection towards a memory or entity.