我许你天长地久我许你海枯石烂
[wŏ xŭ nĭ tiān zhăng dì jiŭ wŏ xŭ nĭ hăi kū shí làn]
Translates to promising everlasting ('as long as time lasts') and indelible ('until stones rot and seas dry up') love to someone. Represents unwavering commitment and eternal promises in a romantic relationship.