Describes how high banks can turn into valleys and deep valleys can become hills; used metaphorically to illustrate immense transformations in the world or how things can turn into their exact opposite under specific conditions.
曾经荒芜的土地，如今高楼林立，真是高岸为谷，深谷为陵，世事变迁令人惊叹。
The once barren land is now dotted with skyscrapers; it truly reflects "high banks become valleys, deep valleys become hills," and the changes in the world are astonishing.
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