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IELTS BNC: 596 COCA: 918
theory
noun /ˈθɪəri/
singulartheory
pluraltheories
  1. 1
    [C] one or more ideas that explain how or why something happens 学说;说法

    The theory predicts low speeds and therefore safety. 该学说预测速度会很慢,因而会更安全。

    theory that :

    He had a theory that the germs caused disease. 他的说法是这些细菌会致病。

     Synonyms and related words
    Explanations and explaining: explanation, interpretation, instructions...
     Synonyms and related words
    Thoughts, ideas and beliefs: thought, idea, belief...
  2. 2
    [U] the set of general principles that a particular subject is based on (某一学科基于的)理论,原理

    the theory and practice of education 教育理论与实践

    psychoanalytic/Marxist/literary theory 精神分析/马克思主义/文学理论

     Synonyms and related words
    Theories and sets of beliefs: theory, culture, philosophy...
  3. 3
    [C] an idea that you believe is true although you have no proof (未经证实的)看法,观点,猜测
    theory about :

    I have my own theory about why he resigned. 关于他辞职的原因我有自己的看法。

    theory that :

    There is a theory that her death was an accident. 有人猜测她的死是个意外。

     Synonyms and related words
    Thoughts, ideas and beliefs: thought, idea, belief...

phrases


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