Refers to the profound and immense changes over time, akin to seas transforming into mulberry fields and hillsides becoming deep valleys; great transformations in the world or in one's life.
这座老宅子见证了城市几十年的海桑陵谷，从一片农田到高楼林立，真是令人感慨。
This old house has witnessed decades of profound transformations in the city, from farmland to a forest of high-rises, which is truly remarkable.
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