伴你天长地久陪你地老天荒
[bàn nĭ tiān zhăng dì jiŭ péi nĭ dì lăo tiān huāng]
'Accompanying you forever, from the beginning of time until the end of the world.' This signifies a promise to be by someone’s side unconditionally for all eternity, indicating unwavering loyalty and dedication in a relationship.