“豹子改变不了身上的斑点”是个比喻，指江山易改本性难移。
"The leopard cannot change his spots" is just a figure of speech.
《柯林斯英汉双解大词典》
花豹永不能改变身上的斑点（指：本性难移）。
The leopard can never change its spots.
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