伴你到海枯石烂陪你至天长地久
[bàn nĭ dào hăi kū shí làn péi nĭ zhì tiān zhăng dì jiŭ]
'Accompany You Until Seas Dry And Stones Rot And Until Heaven Ends And Earths Perishes' . It indicates unconditional love and promises endless companionship and loyalty no matter what happens