分类理论 fēnlèilǐlùn classification theory Origin Definitions Defs Strokes Stroke Words Sentences Sents 分类 分類 fēnlèi verb classification the action or process of classifying something, or a category or group in a system of taxonomy理论 理論 lǐlùn noun theory a system of ideas intended to explain something, especially one based on general principles independent of the thing to be explained; doctrine