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
a tentative insight into the natural world; a concept that is not yet verified but that if true would explain certain facts or phenomena
a belief that can guide behavior
双语例句
1. The theories were demonstrated to be false.
这些理论已被证明是错误的。
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2. His theories are somewhat remote from reality.
他的理论有点儿脱离现实。
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3. His theories have been debunked by recent research.
最近的研究揭穿了他的理论的真相。
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4. His theories have never really been put to the test.
他的理论从未真正经受过检验。
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5. I looked forward to the exploration of their theories.
我期待着对他们的理论进行探讨。
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6. Don't let yourself be distracted by fashionable theories.
别让自己被新潮的理论给分心了。
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7. These theories are now largely discredited among linguists.
这些理论现已大多受到语言学家的质疑。
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8. We'll always justify our actions with noble sounding theories.
我们将始终用崇高的理论思想指导我们的行动。
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9. I accept his theories, but not without certain qualifications.
我接受他的理论，但并非毫无保留。
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10. Over the years several similar theories have been put forward.
多年来几种类似理论被提了出来。
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11. They talked about the competing theories of the origin of life.
他们谈论那些相互矛盾的生命起源理论。
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12. His theories mesh together various political and religious beliefs.
他的理论把各种政治和宗教信仰完美地结合起来了。
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13. We will then have a firmer foundation of fact on which to build theories.
那时我们将有更坚实的事实根据来作为理论的基础。
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14. Aristotle's scientific theories dominated Western thought for fifteen hundred years.
亚里士多德的科学理论统治西方思想长达1500年之久。
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15. Physics is the best example of a science which has developed strong, abstract theories.
物理学是一个发展出了强有力的抽象理论的学科的最好例证。
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16. Da Vinci was methodical in his research, carefully recording his observations and theories.
达·芬奇作研究非常有条理，他仔细地记录下他的观察所得和理论。
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17. All theories originate from practice.
所有的理论都是源于实践。
youdao
18. There are a number of familiar theories.
有许多熟悉的理论。
youdao
19. Theories abound, some more convincing than others.
各种理论层出不穷，有些更有说服力。
youdao
20. Killy began challenging the basic theories of racing technique.
基利开始挑战赛车技术的基本理论。
youdao
21. He is a famous scientist whose theories would change the world.
他是一位著名的科学家，他的理论将改变世界。
youdao
22. We've also talked about the different theories on how that can be done.
我们也讨论了关于如何做到这一点的不同理论。
youdao
23. Scientists have advanced many theories about why human beings cry tears.
关于人类为什么哭的时候会流泪，科学家已经提出了很多理论。
youdao
24. How would all those theories hold up under the pressure of a zombie assault?
在僵尸袭击的压力下，那些理论怎么站得住脚呢？
youdao
25. Scientists have different theories as to why there's a relationship between the two.
对于两者之间关系的由来，科学家们有不同的理论。
youdao
26. A recent study of some of the formations presents some new theories about the area's past.
最近针对一些地层的一项研究提出了一些关于该地区过去形态的新理论。
youdao
27. That hypothesis makes a lot of sense, maybe the most sense of all the theories we read about.
这个假设很有意义，可能是我们读过的所有理论中最有意义的。
youdao
28. So we have been talking about theories that deal with the effects of human activity on the climate.
所以我们一直在讨论人类活动对气候影响的理论。
youdao
29. Scientists have advanced many theories about why human beings cry tears, none of which has been proved.
科学家提出了许多关于人类为什么哭的理论，但没有一个得到证实。
youdao
30. All three theories could be true. In particular, the role of perfume as an olfactory disguise is obvious.
这三个理论都有可能是正确的。特别是香水作为气味掩饰的作用是显而易见的。
youdao
用作名词 (n.)
Let us put his theories to the proof. 让我们来检验一下他的理论。
Later research discredited earlier theories. 后来的研究推翻了早先的理论。
