名词
中文翻译：理论
同义词：
['hypothesis', 'theory of', 'principle']
例句：
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1. The theory of evolution has been testedby countless experiments.
进化论已经被无数的实验所验证。
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2. The theory of relativity wasrevolutionary in its time.
相对论在当时是革命性的。
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3. The theory of quantum mechanics isstill being studied and debated.
量子力学的理论仍在研究和辩论中。