1、theory英[?θ??ri]美[?θi??ri]，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。