一生一世一双人一段一情一世纪
[yī shēng yī shì yī shuāng rén yī duàn yī qíng yī shì jì]
A romantic and solemn declaration about the ideal of spending one's entire life with just one partner. It emphasizes fidelity, commitment, and the depth of monogamous relationships, suggesting a lasting bond over a century.