「江山易改，本性難移」

RIVERS AND MONTAINS CAN BE CHANGED BUT NOT A PERSON'S NATURE.

OR

江山易改，本性難移
A leopard never changes his spots.

http://hk.dictionary.yahoo.com/list.html?s=%A6%BF%A4s%A9%F6%A7%EF

You can't teach an old dog new tricks.
said to mean that it is very difficult to teach someone new skills or to change their habits or character


Definition
You can't teach an old dog new tricks. SAYING
said to mean that it is very difficult to teach someone new skills or to change their habits or character

(from Cambridge Advanced Learner's Dictionary )

江山易改，本性難移 標示解釋

釋義

廣　告

jiang shan yi gai ben xing nan yi
ㄐㄧㄤ ㄕㄢ ㄧˋ ㄍㄞˇ ㄅㄣˇ ㄒㄧㄥˋ ㄋㄢˊ ㄧˊ

1.A leopard never changes his spots.
2.A fox may grow gray, but never good.