这辈子你只能是我的这辈子我只能是你的
[zhè bèi zi nĭ zhĭ néng shì wŏ de zhè bèi zi wŏ zhĭ néng shì nĭ de]
'In This Life, You Can Only Be Mine And I Can Only Be Yours.' A declaration emphasizing exclusivity in relationships, suggesting eternal devotion and uniqueness between two people.