刻骨铭心的痛不用语言表达刻骨铭心的爱不用事实证明
[kè gú míng xīn de tòng bù yòng yŭ yán biăo dá kè gú míng xīn de ài bù yòng shì shí zhèng míng]
It means deep pain does not need words to be expressed, and intense love does not need to be proven through actions. It speaks to the idea that some feelings are so profound they transcend expression through ordinary means.