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IELTS BNC: 596 COCA: 918
*theory
/ˈθɪəri ||; ˈθɪərɪ/noun (plural theories)
1 [C] an idea or set of ideas that tries to explain sth 理论；学说: the theory about how life on earth began 关于地球上生命起源的理论
2 [U] the general idea or principles of a particular subject 理论；原理: political theory 政治理论 the theory and practice of language teaching 语言教学的理论与实践
3 [C] an opinion or a belief that has not been shown to be true 看法；推测；揣度
in theory as a general idea which may not be true in reality 理论上: Your plan sounds fine in theory, but I don't know if it'll work in practice. 你的计划理论上不错，但我不知道实际上是否可行。
IELTS BNC: 596 COCA: 918
theory/ˋθiərI; ˈθIəri/ n plural theories 1 [C] an idea that tries to explain something [→ theoretical] 学说﹔理论: +of Darwin's theory of evolution 达尔文的进化论+about different theories about how the brain works 关于大脑如何运作的各种学说One theory is that he was killed by members of a rival gang. 一种观点认为他是被敌对团伙的成员杀死的。2 in theory something that is true in theory should be true, but may not actually be true 理论上﹐从理论上来说〔实际上未必如此〕: In theory, I don’t work on Saturdays. 理论上来讲﹐我星期六不工作。3 [U] the general principles of a subject〔某一学科的〕理论﹔原理: studying economic theory 学习经济学理论
IELTS BNC: 596 COCA: 918
theory theorytheories noun (plural theories)an idea that tries to explain something: There are a lot of different theories about how life began.

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