与你共天荒地老同你共天长地久
[yŭ nĭ gòng tiān huāng dì lăo tóng nĭ gòng tiān zhăng dì jiŭ]
This implies a promise of eternal love—being together until heaven and earth come to an end. It represents a wish for long-lasting love and loyalty that transcends time, similar to the concept of “till death do us part” but even more enduring.