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

复数：theories　

高考CET4CET6考研IELTSTEM4化学

Oxford 3000 / Collins.4 / BNC.596 / COCA.918

习惯用语

n.

in theory
• 理论上；按理说
  used to say that a particular statement is supposed to be true but may in fact be wrong
• In theory, these machines should last for ten years or more.
  从理论上讲，这些机器应能用十年以上。
• That sounds fine in theory, but have you really thought it through?
  这话听起来很有道理，但是你真正全面考虑过没有？

牛津词典

noun

• 学说；论；说
  a formal set of ideas that is intended to explain why sth happens or exists
  1. According to the theory of relativity, nothing can travel faster than light.
     根据相对论，任何东西都无法超越光速。
• 理论；原理；原则
  the principles on which a particular subject is based
  1. the theory and practice of language teaching
     语言教学理论与实践
• （未证明的）意见；看法；推测
  an opinion or idea that sb believes is true but that is not proved
  1. 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。

柯林斯词典

• N-VAR 理论;学说
  Atheoryis a formal idea or set of ideas that is intended to explain something.
  1. Marx produced a new theory about historical change based upon conflict between competing groups...
     马克思创立了一种新理论，认为历史的演变是基于对立集团之间的冲突之上的。
  2. Einstein formulated the Theory of Relativity in 1905.
     爱因斯坦于 1905 年创立了相对论。
• N-COUNT 观点;见解
  If you have atheoryabout something, you have your own opinion about it which you cannot prove but which you think is true.
  1. There was a theory that he wanted to marry her...
     有人认为他想娶她。
  2. My theory about divorce is that it's not the split-up that damages children, it's how it is handled.
     我对离婚的看法是，伤害孩子的不是婚姻的破裂，而是处理离婚的方式。
• N-UNCOUNT (实践科目、技能的)理论基础
  Thetheoryof a practical subject or skill is the set of rules and principles that form the basis of it.
  1. He taught us music theory.
     他教我们乐理。
  2. ...graduates who are well-trained in both the theory and practice of statistics.
     在统计学理论和实践两方面都训练有素的毕业生
• PHRASE 从理论上说;照理说
  You usein theoryto say that although something is supposed to be true or to happen in the way stated, it may not in fact be true or happen in that way.
  1. A school dental service exists in theory, but in practice, there are few dentists to work in them.
     照理说，学校也有牙医诊所，可实际上，里面的牙医寥寥无几。

英英释义

noun

• a tentative insight into the natural world
  1. a scientific hypothesis that survives experimental testing becomes a scientific theory
  2. he proposed a fresh theory of alkalis that later was accepted in chemical practices
  Synonym:hypothesispossibility
• a belief that can guide behavior
  1. the architect has a theory that more is less
  2. they killed him on the theory that dead men tell no tales
• a well-substantiated explanation of some aspect of the natural world
  1. theories can incorporate facts and laws and tested hypotheses
  2. true in fact and theory

双语例句

• In theory I'm on call day and night.
  从理论上说，我现在昼夜待命。
• This theory is widely derided by conventional scientists.
  这一理论遭到了守旧派科学家的普遍嘲笑。
• They have learned the lessons of business management theory, and put them into action.
  他们不仅学习了商业管理理论方面的课程，并且学以致用。
• Much of her work is speculative, based on psychoanalytic theory rather than empirical data.
  她的著作中有相当一部分内容是推测性的，建立在精神分析理论之上而缺乏来自实际经验的数据。
• The next step is to put the theory into practice
  下一步是要将理论付诸实践。
• These courses provide the groundwork of statistical theory.
  这些课程介绍的是统计学理论的基础。
• Radio signals received from the galaxy's centre back up the black hole theory
  从该星系中心收到的无线电信号证实了黑洞理论。
• This theory has now been discounted.
  这个理论被打了折扣。
• No further illumination can be had from this theory.
  这一理论不能给人以更深刻的启迪。
• Both quantum mechanics and chaos theory suggest a world constantly in flux.
  量子力学和混沌理论都表明世界永远处于不断变化中。