名词
中文翻译：理论
同义词：
['hypothesis', 'principle', 'doctrine']
例句：
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1. Thetheory 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 behind this phenomenon has not beenfully understood yet.
这个现象背后的理论尚未完全理解。
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3. The theory of quantum mechanicsis still a subject of debate amongphysicists.
量子力学的理论仍然是物理学家争论的课题。