第一次疼很刻骨铭心
[dì yī cì téng hĕn kè gú míng xīn]
'第一次疼很刻骨铭心' describes how 'First hurt was very unforgettable or indelible'. A first painful experience tends to impress deep into a person's memory for the impact felt then, whether emotionally or physically, often becomes especially vivid when recalled