The fickleness of human relationships, characterized by people being warm and obsequious when one is successful, and cold and indifferent when one is in decline; snobbery.
他深有感触地说道，自己经历过几次起伏后，才真正看清了这炎凉世态
He said with deep emotion that it was only after experiencing several ups and downs that he truly saw the fickle nature of human relationships.
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