你终究不是我你怎知我难过
[nĭ zhōng jiū bù shì wŏ nĭ zĕn zhī wŏ nán guò]
'Ni zhong jiux bu shi wo ni zen zhi wo nan guo'. Meaning 'In the end you are not me, so how would you know my difficulties?' This reflects one's desire for true understanding between oneself and another person despite the fundamental impossibility, revealing frustration in communication gaps.