theory fruit理论成果theoryn.学说；理论；原理；意见theory of settlement control沉降控制理论theory of strong electrolyte强电解质理论theory of need gratification需求满足论需求满足论theory of collateral disease络病理论theory of transmission lines传输线理论theory teaching in classroom课堂理论教学theory of elastic thin plate弹性薄板理论theory of irrational numbers无理数论theory of nature and destiny天命论theory on hegemony stability霸权稳定论