Great changes over time; what was once high becomes a valley, symbolizing vast transformations or how things can turn into their opposite under certain conditions.
这座城市历经百年，高岸为谷，旧貌换新颜，令人感叹时光的力量。
After a hundred years, this city has seen vast transformations, with high banks becoming valleys, old landscapes giving way to new, making one marvel at the power of time.
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