名词
中文翻译：Unknown
同义词：
['hypothesis', 'theory', 'principle', 'doctrine']
例句：
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1. The theory of relativity was proposed by Albert Einstein.
爱因斯坦提出了相对论的理论。
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2. The theory of evolution suggests that all living organisms have descended from a common ancestor.
进化论表明所有现存生物都来自共同的祖先。
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3. The theory of quantum mechanics explains how particles interact with each other.
量子力学理论解释了粒子之间的相互作用。