狗改不了吃屎 [ㄍㄡˇ ㄍㄞˇ ㄅㄨˋ ㄌㄧㄠˇ ㄔ ㄕˇ; gou3 gai3 bu4 liao3 chi1 shi3] a dog can't stop himself from eating shit bad habits are hard to change ◄ ►