a leopard can't/doesn't change its spots idiom saying
江山易改，本性难移。
something you say that means a person's character, especially if it is bad, will not change, even if they pretend that it will
江苏热线英汉汉英双解词典包含207361条英汉翻译词条，涵盖了常用英语单词及词组短语的翻译及用法，是英语学习的必备工具。