你说你爱我那就天长地久我说我爱你必须万劫不复
[nĭ shuō nĭ ài wŏ nèi jiù tiān zhăng dì jiŭ wŏ shuō wŏ ài nĭ bì xū wàn jié bù fù]
It roughly translates as 'You say you love me and it's an eternal love; I say I love you so deeply that even countless hardships would never change my feelings'. The expression showcases strong contrasts in two different types of love, illustrating unconditional and undying devotion.