One's heart is as calm and still as an ancient well; emotionally undisturbed; serene and tranquil; showing no emotional response or agitation.
他经历了大起大落后，对世间的浮华早已心如古井，不为所动。
After experiencing significant ups and downs, his heart had long become as still as an ancient well towards worldly extravagance, unmoved by it.
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