爱人是一种致命的痛思念是一把锋利的刀
[ài rén shì yī zhŏng zhì mìng de tòng sī niàn shì yī bă fēng lì de dāo]
'Loving One Hurts Mortally; Missing Him/Her Sharpens This Pain into a Knife.' Expresses an intense, heartrending love accompanied by piercing longing for the loved person, comparing these emotions to sharp, cutting tools signifying pain.