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素手宛花
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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