承诺的海枯石烂允许的天长地久
[chéng nuò de hăi kū shí làn yŭn xŭ de tiān zhăng dì jiŭ]
'The Eternity in Promises till the Sea Dries and Stones Rot' refers to unwavering commitment, vows that will last eternally no matter changes occur. It conveys deep-seated love, loyalty, or determination despite inevitable hardships and passage of time.