天长地久的承诺海枯石烂的守候
[tiān zhăng dì jiŭ de chéng nuò hăi kū shí làn de shŏu hòu]
Literally means "Eternal Promise and Waiting Until the Sea Dries Up". This signifies an everlasting commitment and loyalty that defies time and change. It expresses deep dedication, usually in the context of love or friendship.