刻骨铭心铭记于心
[kè gú míng xīn míng jì yú xīn]
'Ke Gu Ming Xin' translates to 'Inscribed on Bones, Marked in Heart', which conveys a deep and unforgettable memory or emotion. It suggests that the person's experiences or feelings are so significant that they will never be forgotten, leaving an indelible mark on the heart.