Nà duàn jīnglì zài tā xīnlǐ liúxià le shēnshēn de làoyìn.
That experience left a deep mark on his heart.
Tips
usage
Often used figuratively: 时代的烙印 (the stamp of an era), 心理烙印 (psychological imprint). The physical meaning (branding cattle) is less common in modern use.