What does he mean by ressentiment and what role does it play in the history of morality?

他说的‘ressentiment’是意思?在伦理学史上，它扮角色?

Nietzsche speaks often of resentment but uses the French for ressentiment, in an effort to turn it into a term of art - that is, a technical term, a piece of jargon.

尼采论及“愤懑”（resentment）,用法文‘ressentiment’，并试着把它转变为艺术的术语,也就是行话。