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

• He taught us music theory.
  他教我们乐理。
• 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 bears no relation to reality.
  这个理论和现实没什么联系。
• 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。
• One theory is that the infection has been present in humans for a very long time
  有一种理论认为，这种传染病存在于人类中已经有很长时间了。
• This theory has now been discounted.
  这个理论被打了折扣。
• My theory is established on the solid basis of facts.
  我的理论是以可靠的事实作为根据的。
• 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。
• Einstein's theory of relativity won for him universal esteem.
  爱因斯坦的相对论赢得了全世界对他的崇敬。
• There was a theory that he wanted to marry her
  有人认为他想娶她。