这辈子你是我的这辈子我是你的
[zhè bèi zi nĭ shì wŏ de zhè bèi zi wŏ shì nĭ de]
In this life, you belong to me; in this life, I am yours. It represents the commitment of two souls intertwined for the long run, expressing mutual ownership or possession of one another's lives as lovers.