对你的承诺生死相伴许你的约定长相厮守
[duì nĭ de chéng nuò shēng sĭ xiāng bàn xŭ nĭ de yuē dìng zhăng xiāng sī shŏu]
Expresses an eternal vow - 'promises to live and die with you' and agreeing to spend a lifetime together. It reflects profound love that wishes for an everlasting relationship, even transcending death or time.