许你一世承诺到海枯石烂许你一生爱恋到地老天荒
[xŭ nĭ yī shì chéng nuò dào hăi kū shí làn xŭ nĭ yī shēng ài liàn dào dì lăo tiān huāng]
This long phrase translates as 'promise eternal devotion till the seas run dry and stones crumble, pledge undying love until earth and sky are exhausted.' This represents an unwavering vow and deep affection spanning lifetimes.