拼音：qī shí èr biàn，běn xiàng bán biàn
解释：即使有七十二个变化，但其原来的面目却难以改变。比喻事物虽然千变万化，但其本质却难以改变。
出处：明·吴承恩《西游记》载：孙司空会七十二变，只有尾巴变不了。
Even though there are 72 changes, it is difficult to change its original face. Although things are ever-changing, their essence is difficult to change.
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