leopard豹子，change改变；变化，spot斑点，a leopard can't change its spots跟中文的“江山易改，本性难移”相对应，说明改变人的本性的比江山的变迁还更难，尽管人们很努力去改变自己，但并没有从根本上进行。

【例句】
He has always been a dishonest person, and it's clear that a leopard can't change its spots.
他一直都是一个不诚实的人，而且很明显，本性难移。

She promised to stop procrastinating, but it seems that a leopard can't change its spots. She's still leaving everything until the last minute.
她承诺停止拖延，但看来本性难移。她仍然把所有事情拖到最后一刻。