The traditional definition of knowledge (JTB) is not sufficient and necessary condition, searching for the definition of knowledge has not stopped since Gettier proposed counter examples to prove it, but almost nome of the corrections are satisfactory.

• 传统的知识定义(JTB)不是知识的充分必要条件,自盖梯尔(Gettier)提出反例证明了这一点之后,对“知识”定义的探讨就一直没有停止过,但几乎所有的修正都不能令人满意。