中坚分子 zhōngjiānfènzǐ backbone Origin Definitions Defs Strokes Stroke Words Sentences Sents 中坚 中堅 zhōngjiān backbone The core or most important members of a group who play a leading role; nucleus; hardcore分子 fènzǐ noun member A person who belongs to a specific group or class, often used to describe a certain type of person or social element.