plural theories
plural theories
Learner's definition of THEORY
1
: an idea or set of ideas that is intended to explain facts or events学说；…论；…说 [count]
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a widely accepted scientific theory一个被广泛接受的科学论断
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Einstein's theory of relativity爱因斯坦的相对论
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theories on/about evolution进化论
[noncount]
2
[count] : an idea that is suggested or presented as possibly true but that is not known or proven to be true看法；设想；猜测 -
Her method is based on the theory that all children want to learn.她的方法是基于所有孩子都想学的设想。
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There are a number of different theories about the cause of the disease.关于这种病的起因有很多种猜测。
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She proposed a theory of her own.她提出了自己的看法。
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Investigators rejected the theory that the death was accidental.调查人员排除了意外死亡的猜测。
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There is no evidence to support such a theory.没有证据支持这个假设。
3
[noncount] : the general principles or ideas that relate to a particular subject理论；原理；原则
in theory
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used to say what should happen or be true if a theory is correct从理论上讲；按理说 2
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used to say that something seems to be true or possible as an idea but may not actually be true or possible在理论上（是正确的或有可能的） -
I agree with you in theory, but realistically I don't think we have the time to do that.从理论上讲我同意你的看法，但实际上我觉得我们没有时间这么做。
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Her plan sounds good in theory, but I doubt it will really work.