theory英 [ˈθiːərɪ] 。
n.学说；论；说；理论；原理；原则；(未证明的)意见；看法；推测。
用作名词 (n.)。
1. There're many theories about the origin of life.
关于生命起源的学说有很多。
2. In theory, anything could happen.
理论上来说,任何事情都会发生。
3. everyone can understand Einstein's Theory of Relativity.
不是每个人都能读懂爱因斯坦的相对论的。
双语例句：
1. Buddhism is not theory, but practice.
佛教不是理论而是实践。
2. Zoologist Eugene Morton has propounded a general theory of the vocal sounds that animals make.
动物学家尤金•莫顿提出了一个有关动物发声的概括性理论。
3. This theory has now been discounted.
现在这一理论已经没人相信了。
4. It's only a theory, admittedly, but the pieces fit together.
不可否认这只是一种理论，但是各部分都互相吻合。
5. pantheistic theory.
泛神论理论。
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