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IELTS BNC: 596 COCA: 918
theorynoun [ C or U ]uk/ˈθɪə.ri/ us/ˈθɪr.i/

B2 a formal statement of the rules on which a subject of study is based or of ideas that are suggested to explain a fact or event or, more generally, an opinion or explanation理论；学说；意见

economic theory经济理论
scientific theory科学理论
Darwin's theory of evolution达尔文的进化论
He has a theory that the hole was caused by a meteorite.他认为那个洞是陨石坠落形成的。
in theory

B2 If something is possible in theory, it should be possible, but often it does not happen in that way.理论上，从理论上讲

In theory, the journey should take three hours, but in practice it usually takes four because of roadworks.按理说行程应该只要3小时，但由于道路施工，实际上通常会需要4小时。

More examples

It was Ptolemy who propounded the theory that the earth was at the centre of the universe.

This new evidence lends support to the theory that she was murdered.

This research seems to give some validity to the theory that the drug might cause cancer.

In Jungian theory, there are certain archetypes of human personality.

In theory, women can still have children at the age of 50.

IELTS BNC: 596 COCA: 918
theory

noun

ADJECTIVE | ... OF THEORIES | VERB + THEORY | THEORY + VERB | PREPOSITION | PHRASES ADJECTIVE➤complete, unified完整的／統一的理論◇a grand unified theory of the physical forces governing matter控制物質的各種物理作用力的大統一理論➤general一般理論▸➤coherent連貫理論▸➤current, modern, new當前理論；現代理論；新理論▸➤classical經典理論◇Keynes misinterpreted the classical theory of interest.凱恩斯曲解了古典利息論。➤pet喜愛的理論◇One of her pet theories is that people who restrict their calorie intake live longer.她中意的論調之一就是限制熱量攝入的人更長命。➤alternative, conflicting替代／相互矛盾的理論▸➤abstract抽象的理論◇His comments are just abstract theory and show little understanding of the realities of the situation.他的意見只是抽象的理論，對實際情況幾乎毫無瞭解。➤economic, legal, linguistic, literary, political, scientific, social, etc.經濟學、法律、語言學、文學、政治學、科學、社會學等理論▸➤critical批判性理論▸➤feminist, Marxist, postmodern, structuralist, etc.女權主義、馬克思主義、後現代派、結構主義等理論◇Current feminist theory consists of several different trends.當前的女權主義理論有好幾種不同的走向。◇the dominant strand of postmodern theory後現代理論的主流➤chaos, evolutionary, game, number, probability, quantum, string, etc.混沌理論、進化論、博弈論、數論、概率論、量子理論、弦理論等▸➤conspiracy陰謀論◇a conspiracy theory about the princess's death關於王妃之死的陰謀論... OF THEORIES➤set一套理論◇Each school has its own set of theories.每一個學派都有自己的一套理論。VERB + THEORY➤have, hold有理論；持有理論▸➤advance, develop, formulate, present, produce, propose, put forward提出理論；發展學說；創立理論▸➤work on根據推測工作◇Police are working on the theory that the murderer was known to the family.警方的工作基於一種猜測，即兇手是那家人的熟人。➤refute, reject反駁／駁斥學說▸➤accept接受理論▸➤confirm, prove, support證實／證明／支持理論▸➤disprove證明理論錯誤▸➤challenge, test挑戰／檢驗學說▸➤apply, use應用／使用理論THEORY + VERB➤hold sth, suggest sth理論認為⋯／表明⋯▸➤explain sth, predict sth理論解釋⋯／預測⋯▸➤be based on sth理論基於⋯PREPOSITION➤in theory理論上◇In theory, these machines should last for ten years.理論上，這些機器應該能用 10 年。➤theory about關於⋯的理論◇He has a theory about why dogs walk in circles before going to sleep.他有一種理論解釋狗在睡覺之前為什麼要走幾圈兒。PHRASES➤put (the) theory into practice, theory and practice把理論運用到實踐中；理論與實踐◇the distinction / relationship between theory and practice理論與實踐的區別／關係
IELTS BNC: 596 COCA: 918
theory noun
⇨ theory 1 (the theory of relativity) ⇨ theory 2 (I have this theory that…)theory1

noun

 the theory of relativity 相对论I have this theory that... 依我看⋯theory ♦︎ principle ♦︎ law ♦︎ rule ♦︎ theoremThese are all words for an idea or set of ideas that explains why sth happens or why sth exists. 这些词均表示学说、理论、原理。PATTERNS AND COLLOCATIONS 句型和搭配◆a theory / law / rule / theorem about sth◆the theory / principle behind sth◆in theory / principle◆the theory / principle / law / rule / theorem that...◆a basic / fundamental theory / principle / law / rule / theorem◆a mathematical theory / principle / law / rule / theorem◆a scientific theory / principle / law / rule◆to prove a theory / principle / law / rule / theorem◆to define a law / rule◆to apply a theory / principle◆a theory / principle / law / rule / theorem states that...■ theory [countable, uncountable] a formal set of ideas that is intended to explain why sth happens or exists; the ideas on which a particular subject is based 学说；理论◆There are conflicting theories as to the very early origins of mankind.关于人类最早的起源有些相互矛盾的理论。◆According to Einstein's theory of relativity, nothing can travel faster than light.根据爱因斯坦的相对论，任何东西都无法超越光速。◆He wrote a number of books on political theory.他撰写了几本政治理论方面的书。◆In theory, all children get an equal chance at school.从理论上讲，所有孩子在学校都能获得平等的机会。  see also theoretical ⇨ intellectual 1 ■ principle [countable, uncountable] an idea or theory that sth is based on; a general or scientific idea that explains how sth works or why sth happens 法则；原则；原理；定律◆The principle behind it is very simple.这背后的原理很简单。◆We must get back to first principles (= the basic principles of sth).我们必须回到根本原则上来。◆It is based on the principle that heat rises.这是基于热气上升的定律。◆A tidal current turbine is similar in principle to a windmill.潮流涡轮机从原理上和风车相似。  see also principle ⇨ principle 2 ■ law [countable] the fact that sth always happens in the same way in an activity or in nature; a scientific statement made by sb that explains a natural process 规律；法则；原理；定律◆The usual laws of supply and demand do not seem to apply in this case.一般的供求规律似乎不适用于这种情况。◆Do you remember anything about Ohm's Law?你还记得欧姆定律吗？  see also law ⇨ principle 2 ■ rule [countable] a statement of what is possible according to a particular system, for example the grammar of a language 规则；法则◆He's a writer who doesn't seem to know the most basic rules of English grammar.他这个作家似乎连最基本的英语语法规则都不知道。  see also rule ⇨ principle 2 ■ theorem ˈθɪərəm; NAmE ˈθiːərəm, ˈθɪrəm [countable] (technical 术语) a rule or principle, especially in mathematics, that can be proved to be true （尤指数学）定理◆Work out the answer using Pythagoras's Theorem.运用毕达哥拉斯定理算出答案。theory2

noun

 the theory of relativity 相对论I have this theory that... 依我看⋯theory ♦︎ hypothesis ♦︎ premise ♦︎ thesis ♦︎ propositionThese are all words for an idea that sb believes but that has not yet been proved, especially one used as the basis for another idea or proposal. 这些词均表示假说、假设，尤指可用作其他观点或提议基础的假定。PATTERNS AND COLLOCATIONS 句型和搭配◆a theory / hypothesis / thesis / proposition about sth◆a theory / hypothesis / thesis on sth◆a theory / hypothesis / premise / thesis / proposition that...◆to have a theory / hypothesis / premise / thesis◆to formulate a theory / hypothesis / thesis◆to support a theory / hypothesis / premise / thesis / proposition◆to test a theory / hypothesis / premise / proposition◆to prove a theory / hypothesis / thesis / proposition◆to be based on a theory / hypothesis / premise / thesis / proposition◆a theory / hypothesis / premise / thesis / proposition is based on sth■ theory [countable, uncountable] an opinion or idea that sb believes is true but that has not been proved （未经证明的）意见，看法；推测◆I have this theory that most people prefer being at work to being at home.依我看，多数人喜欢工作而不愿待在家里。◆This is all theory so far...you'll need to back it up with facts.到目前为止，这都是推测，你需要用事实来印证。■ hypothesis haɪˈpɒθəsɪs; NAmE haɪˈpɑːθəsɪs(plural hypotheseshaɪˈpɒθəsiːz; NAmE haɪˈpɑːθəsiːz) [countable] (rather formal) an idea or explanation of sth that is based on some known facts but has not yet been proved to be true or correct （有一定事实依据但未被证实的）假说，假设◆His hypothesis about what dreams mean provoked a lot of debate.他关于释梦的假说激起很多争论。◆This economic model is really a working hypothesis (= sth that people are using as if it were true or correct but which may yet be proved wrong).这个经济模型实际上是一个暂定的假说，以便展开分析。  see also hypothetical ⇨ supposed ■ premise ˈpremɪs [countable] (formal) a statement or idea that forms the basis for a reasonable theory 前提；假定◆The basic premise of this argument is deeply flawed.这一论据的基本前提有很大缺陷。◆The argument rests on a false premise.这个论点是以错误的前提为基础的。■ thesis ˈθiːsɪs (plural theses ˈθiːsiːz ) [countable] (rather formal) a statement or opinion that is discussed in a logical way and presented with evidence to prove that it is true 命题；论题◆The basic thesis of the book is fairly simple.这本书的基本观点相当简单。  see also thesis ⇨ paper ■ proposition ˌprɒpəˈzɪʃn; NAmE ˌprɑːpəˈzɪʃn [countable] (formal) a statement that expresses an opinion, especially one used as the basis of an argument （尤指作为论证基础的）命题，主张，观点◆Her argument is based on the proposition that power corrupts.她的论证是建立在权力使人堕落的观点上。
IELTS BNC: 596 COCA: 918
theory
Explanations and explaining: explanation, interpretation, instructions...
Thoughts, ideas and beliefs: thought, idea, belief...
Theories and sets of beliefs: theory, culture, philosophy...

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