"the fox may grow grey but never good" meaning in 英語

{
  "categories": [
    {
      "kind": "other",
      "name": "有1個詞條的頁面",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "英語詞元",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "英語諺語",
      "parents": [],
      "source": "w"
    }
  ],
  "lang": "英語",
  "lang_code": "en",
  "pos": "proverb",
  "senses": [
    {
      "glosses": [
        "江山易改，本性難移"
      ],
      "id": "zh-the_fox_may_grow_grey_but_never_good-en-proverb-shAfVjn0"
    }
  ],
  "synonyms": [
    {
      "word": "the wolf may lose his teeth but never his nature"
    },
    {
      "word": "a leopard cannot change its spots"
    }
  ],
  "word": "the fox may grow grey but never good"
}

{
  "categories": [
    "有1個詞條的頁面",
    "英語詞元",
    "英語諺語"
  ],
  "lang": "英語",
  "lang_code": "en",
  "pos": "proverb",
  "senses": [
    {
      "glosses": [
        "江山易改，本性難移"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "the wolf may lose his teeth but never his nature"
    },
    {
      "word": "a leopard cannot change its spots"
    }
  ],
  "word": "the fox may grow grey but never good"
}