theory frame理论框架theoryn.学说；理论；原理；意见theory of continuous media连结介质理论theory and systerm analyst机理分析theory of obligatory right债权说theory of Core-periphery核心-边缘理论theory of sample selection汁液样品选择原理theory of escaping freedom逃避自由论theory of artistic history艺术发展论theory of social conflicts冲突理论theory of assistant fixing辅助定位原理Theory of Democratic Peace民主和平论