爱你爱到天荒地老恋你恋到海枯石烂
[ài nĭ ài dào tiān huāng dì lăo liàn nĭ liàn dào hăi kū shí làn]
Expressing undying devotion and deep affection, it means loving someone infinitely and eternally till 'time stops' or nature changes course entirely; symbolizing the ultimate intensity in love.