我们的天荒地老我们的海誓山盟
[wŏ men de tiān huāng dì lăo wŏ men de hăi shì shān méng]
'Our love spans eternity. Our promises are as solid as mountains and as deep as seas.' It conveys deep and everlasting commitment in relationships, using natural imagery to symbolize unbreakable and undying loyalty and promises between lovers.