英 [ˈθɪəri] 美 [ˈθiːəri]
n. 学说，理论；（某一学科基于的）理论，原理；观点，见解
复数theories
theory /ˈθɪərɪ/ CET4 TEM4
有变体名词 A theory is a formal idea or set of ideas that is intended to explain something. 理论
Marx produced a new theory about historical change based upon conflict between competing groups.
马克思提出了一个新理论，认为历史变革是由于对立集团的冲突而产生的。
可数名词 If you have a theory about something, you have your own opinion about it which you cannot prove but which you think is true. 观点
There was a theory that he wanted to marry her.
有种观点认为他想娶她。
不可数名词 The theory of a practical subject or skill is the set of rules and principles that form the basis of it. 基础理论
He taught us music theory.
他教我们乐理。
习语 You use in theory to 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. 从理论上说
Achieving these goals is relatively easy in theory, yet quite difficult in practice.
实现这些目标从理论上说比较容易，但在实践上却相当困难。
a well-substantiated explanation of some aspect of the natural world; an organized system of accepted knowledge that applies in a variety of circumstances to explain a specific set of phenomena
true in fact and theory
a tentative theory about the natural world; a concept that is not yet verified but that if true would explain certain facts or phenomena
a scientific hypothesis that survives experimental testing becomes a scientific theory ; he proposed a fresh theory of alkalis that later was accepted in chemical practices
同义词： hypothesis / possibility
a belief that can guide behavior
the architect has a theory that more is less ; they killed him on the theory that dead men tell no tales
原理-引用次数：2705
The third part is the theory base of CFG IS.
在第三章中，对农地分等的基本原理和地理信息系统（GIS）的基本原理进行了系统的介绍。
参考来源县域农地分等信息系统研究
理论-引用次数：27982
Part one discusses the basic theory of the Right.
第一部分任意解除权的基本理论。
理沦-引用次数：4
参考来源关联理论框架下的隐含义研究
机理-引用次数：410
The growth theory of the three whiskers was studied.
对这三种晶须的生长机理作了简单的分析。
学说
理论
义理-引用次数：12
理论
学理-引用次数：29
The elaboration will expand the original vision of practical aesthetics, enrich its academic theory with new phenomena and concepts and better merge into the contemporary practice of ecological beautification.
阐发这一维度将扩大实践美学原有的视野，以新的现象和观念丰富其学理，更好地融入生态美化的当代实践。
参考来源实践美学的生态维度研究
理论
事实证明：如果将科学比喻成一张三脚桌，那么数据(data)、理论(theory)和阐释(narrative)就是这张桌子的三只脚，缺了其中任何一只，桌子都会塌掉。
再者，能把此类设计定于一个合理的价位，希尔瑞时装 (Theory) 是美国第一家。
...来自美国纽约THEORY(希尔瑞)是一个后现代时装品牌，创立于1997年。THEORY时装创办人是Andrew Rosen(安德鲁.
theoretical 理论的；理论上的；假设的；推理的
theoretic 理论上的；空谈的
theoretically 理论地；理论上
理论；原理；学说；推测
mechanism / element / speculation / doctrine / guess
The theory remains untested.
该理论仍未经过验证。
The theory does not apply universally.
这个理论并非放之四海而皆准。
It was a theory unsupported by evidence.
这是一条没有证据支持的理论。
Another theory is that Kim Jong Un might try to build power by dismissing opponents and inciting South Korea.
VOA : special.2010.10.02
Now this may suggest a certain condescension both toward theory and toward literary text, which is not at all intended.
选择这篇文章也许意味着,要对理论和文本进行一定的浓缩，这一点不是我想要的。
文学理论导论课程节选 : 耶鲁公开课
That is to say, theory has certain ambitions to a totalization of what can be thought that resembles or rivals philosophy.
也就是说，理论探讨的问题,与哲学相似或相媲美,而且倾向于把它完整化。
文学理论导论课程节选 : 耶鲁公开课
His theory was that Martians were trying to bring water to the warm areas near the equator of the planet.
VOA : special.2010.07.11
Another theory says that the stress of having to pay constant attention to survive leads to Third Man hallucinations.
VOA : special.2010.02.24
Neoclassical economic theory says that optimum results are achieved when the relation is close.
So a diesel hybrid, in theory, will give you the best of both worlds.
Because in theory, the HOV lanes are flowing more freely than the stop and go traffic.