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| NOUN |
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| /ˈΘɪəri/ |
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| 1 | C one or more ideas that explain how or why something happens 学说；说法 |
| The theory predicts low speeds and therefore safety. 该学说预测速度会很慢，因而会更安全。 |
| +that He had a theory that the germs caused disease. 他的说法是这些细菌会致病。 |
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| 2 | U the set of general principles that a particular subject is based on （某一学科基于的）理论，原理 |
| the theory and practice of education 教育理论与实践 |
| psychoanalytic/Marxist/literary theory 精神分析/马克思主义/文学理论 |
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| 3 | C an idea that you believe is true although you have no proof （未经证实的）看法，观点，猜测 |
| +about I have my own theory about why he resigned. 关于他辞职的原因我有自己的看法。 |
| +that There is a theory that her death was an accident. 有人猜测她的死是个意外。 |
| PHRASE |
| - | in theory
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| used for saying that something is believed to be true , although it may not be true |
| 从理论上讲 |
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| In theory, anything could happen. 从理论上讲，什么事都可能发生。 |
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