semicircle theoremtheory 英[ˈθɪəri] 美[ˈθiːəri] n. 学说; 论; 说; 理论; 原理; 原则; (未证明的) 意见; 看法; 推测; [例句]Marx produced a new theory about historical change based upon conflict between competing groups马克.思创立了一种新理论，认为历史的演变是基于对立集团之间的冲突之上的。[其他] 复数：theories
1、theory英[ˈθɪəri]美[ˈθiːəri]，n.学说; 论; 说; 理论; 原理; 原则; (未证明的)意见; 看法; 推测; 2、[例句]Da Vinci was methodical in his research, carefully recording his observations and theories。达·芬奇搞研究井井有条，会详细记录观察资料和理论学说。
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