如果可以请天荒地老如果可以请地老天荒
[rú guŏ kĕ yĭ qĭng tiān huāng dì lăo rú guŏ kĕ yĭ qĭng dì lăo tiān huāng]
Literally asking for 'If possible, let heaven age, let earth decay'; it represents wishing an impossibly eternal time span or undying commitment in romantic contexts similar to 'till death do us part'. A way to express eternal love and unwavering dedication.