本性难移/Its impossible to change your basic characteristics./A leopard cannot change its spots./Old habits die hard.1. 冰生于水而寒于水,青出于蓝而胜于蓝/Indigo is derived from blue but is more pleasing than blue; ice is formed out of water but is colder than water./The master is surpassed by the apprentice.2. 病从口入,祸从口出/Sickness goes in through the mouth and trouble comes out of the mouth.3. 不入虎穴,焉得虎子/If you dont go into the cave of the tiger, how