成分 (chéng fèn) refers to a constituent part or ingredient that makes up a mixture or substance (e.g., food ingredients, chemical components). It is broader than 零件/部件 (specific physical parts of a machine) and more concrete than 因素 (abstract factor) or 元素 (element, often chemical or fundamental). Its second, dated sense means 'class background' (family social status), distinct from 身价 (personal prestige or market value).