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

他说的‘ressentiment’意思?在伦理学史上，它扮演角色?

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.

尼采常论及“愤懑”（resentment）,但却使用法文‘ressentiment’，并试把它转变为艺术的术语,也就行话。