theory of ...
表示某种学说或理论时常用此结构
the theory of relativity
相对论
推测；猜想；看法；原理；基础理论；学科；公理体系；理论系统；（棋类等游戏的）定式；开局理论；被认为准确描述事件或系统的说明
A set of ideas or a systematic explanation intended to describe or account for something, especially one based on general principles.
被认为准确描述事件或系统的说明
A description of an event or system that is considered to be accurate.
对自然界某方面的充分证实的解释；在多种情况下适用的公认知识体系,用于解释特定现象集
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
解释观察现象并正确预测新现象的系统性观念；经观察、实验证实的假设
A coherent statement or set of ideas that explains observed facts or phenomena and correctly predicts new facts or phenomena not previously observed, or which sets out the laws and principles of something known or observed; a hypothesis confirmed by observation, experiment etc.
对自然界的初步见解；尚未验证但若为真则可解释某些事实或现象的概念
a tentative insight into the natural world; a concept that is not yet verified but that if true would explain certain facts or phenomena
某技艺、艺术等的原理或方法,相对于实践
The underlying principles or methods of a given technical skill, art etc., as opposed to its practice.
可以指导行为的信念
a belief that can guide behavior
试图全面描述特定一类结构的学科
A field of study attempting to exhaustively describe a particular class of constructs.
由公理及所有可推导命题组成的集合；或形式语言加公理(可推出定理)的演绎系统
A set of axioms together with all statements derivable from them; or, a set of statements which are deductively closed. Equivalently, a formal language plus a set of axioms (from which can then be derived theorems). The statements may be required to all be bound (i.e., to have no free variables).
(棋类等)开局定式及走法的标准化与研究
The standardization and study of fixed sequences of moves, especially in the opening phase of a game.
The teacher explained the theory of gravity to the class.
老师向全班解释了万有引力理论。
用法提示：theory 是名词，表示解释自然现象的系统学说。
AI contextual example
My friend has a theory about why the bus is always late.
我的朋友有一个关于公交车为什么总是晚点的猜测。
用法提示：此处 theory 为名词，指一种个人的推测或看法。
AI contextual example
The theory explains how the economy grows over time.
这一理论解释了经济如何随时间增长。
用法提示：theory 是名词，指一套系统的解释框架。
AI contextual example
表示某种学说或理论时常用此结构
the theory of relativity
相对论
后接同位语从句，说明理论的具体内容
the theory that the Earth is round
地球是圆的理论
用于表示理论上，常与 in practice 相对
In theory, this method saves time.
理论上，这种方法节省时间。
指基于个人思考的推测或想法
She has a theory about the cause of the disease.
她对这个疾病的起因有一套推测。
假设或初步解释，不如 theory 证据充分，用于科学语境需注意区分
强调结构化描述，多用于科学或数学，不总是与理论完全互换
更广泛，不特指解释性体系，可指任何抽象想法
侧重基本定律，常为理论的核心，但自身不一定是系统解释
grammar · medium
易错句子According to theory, it works.
正确表达According to the theory, it works.
中文学习者常遗漏冠词，因为中文中没有冠词体系。在英文中，当特指某个已知的理论时，必须使用定冠词'the'。
grammar · medium
易错句子I have many theory to learn.
正确表达I have many theories to learn.
中文中'理论'可数但无复数变化，而英语中'theory'的复数形式是'theories'。当表示多个理论时，必须用复数形式。
理论是经过验证的系统解释，假说是未经证实的初步猜想
理论是广泛的解释体系，定理是数学中可证明的命题
科学理论
The scientific theory was supported by extensive evidence.
这一科学理论得到了大量证据的支持。
进化论
Darwin's theory of evolution revolutionized biology.
达尔文的进化论彻底改变了生物学。
经济理论
Keynesian economic theory influenced government policies.
凯恩斯经济理论影响了政府政策。
理论上
In theory, this plan should work, but we need to test it.
理论上，这个计划应该可行，但我们需要测试一下。
政治理论
The course covers major political theories from Plato to Marx.
这门课程涵盖了从柏拉图到马克思的主要政治理论。
弦理论
String theory attempts to unify general relativity and quantum mechanics.
弦理论试图统一广义相对论和量子力学。
root
suffix
科学理论通常始于一个有待检验的假设。
理论需要通过证据来支持或反驳。
实验是检验理论的重要手段。
理论常以模型的形式来描述现象。
一个好的理论能够做出可检验的预测。
理论上
In theory, this plan should work, but we need to test it.
理论上讲，这个计划应该可行，但我们需要测试一下。
钟爱的理论
His pet theory about the economy has been proven wrong.
他关于经济的钟爱理论已被证明是错误的。
工作理论
My working theory is that the problem is caused by a software bug.
我的工作理论是问题由软件漏洞引起。
理论上，理论和实践没有区别。实际上，却有区别。
Einstein's theory of relativity changed our understanding of the universe.
爱因斯坦的相对论改变了我们对宇宙的理解。
理论可以通过实验证实；但没有一条路从实验通往理论的诞生。
The theory of evolution is supported by a vast amount of evidence.
进化论有大量证据支持。
Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY.