海枯石烂hǎi kū shí làn直到海水枯干,石头粉碎。形容经历极长的时间(多用于誓言,反衬意志坚定,永远不变{usu. in an oath expressing firm will and unchanging fidelity}){even if the seas should run dry and the rocks crumble — no matter what happens and for how long; till seas run dry and rocks melt away}: ～,此心不移。{The seas may run dry and the rocks may crumble, but my heart will always remain loyal.}