(idiom) enduring and unchanging like the heavens and the earth; often used to describe eternal love or friendship

enduring as long as the world lasts; used to describe eternal friendship or love; also written [[天长地久|天長地久|tian1 chang2 di4 jiu3]]

after a long time has passed; over a long period of time

Tianchang, a county-level city in Chuzhou City, Anhui Province

as time goes by; over a very long period of time; long-lasting

The title of the song "Auld Lang Syne", often sung to mark the start of a new year or as a farewell.

to face the heavens and heave a long sigh; to feel helpless or frustrated because there is no way out of a situation

the song "Auld Lang Syne", sung to mark the start of a new year or as a farewell; literally "may friendship last as long as heaven and earth"