He claims to have a certain kind of knowledge of what justice is, and claims to be able to teach it to others.

他声称拥有,某种解释正义的知识，并声称自己能向他人传授这种知识。

耶鲁公开课 - 政治哲学导论课程节选

Most importantly you might say what distinguishes the gentleman as a class from the philosophers is a certain kind of knowledge or practical intelligence.

你可能会说，最重要,能区别出,绅士阶级与哲学家的地方,是一种特定的知识,或实际智能。

耶鲁公开课 - 政治哲学导论课程节选