名词
中文翻译：理论
同义词：
['theory', 'doctrine', 'philosophy']
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理论。
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2. The philosopher believed in the importance of education.
这位哲学家相信教育的重要性。
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3. The theory behind this phenomenon has not been fully explained yet.
这个现象背后的理论尚未完全解释清楚。