theory head理论扬程theoryn.学说；理论；原理；意见theory of encasement套装说theory of fuzzy sets模糊集合论theory of the climax顶极群落理论theory and knowledge理论和知识theory of thin ships薄船理论theory of complexity复杂性理论theory of accounting会计理论theory of regulation调节原理theory of multiplets[化] 巴兰金多重催化理论theory of estimation估计理论