jiāng shān yì gǎi，bǐng xìng nán yí
政体容易更改，本性难于变移，比喻生性风格或既成的事实难以改变
明·冯梦龙《醒世恒言》第35卷：“常言道得好：‘江山易改，禀性难移。’”
江山易改，禀性难移作宾语、定语、分句；用于劝诫人。
It's easy to change rivers and mountains but hard to change a person's nature
