- 释义：
- n. 理论；学说；原理
- 例句：
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Their course of study includes elementary hygiene and medical theory.
他们的课程包括基础卫生学和医疗知识.
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Einstein's theory links energy with mass and velocity of light.
爱因斯坦的理论把能量同质量和光速联系起来.
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It is not a theory that is commonly subscribed to.
一般人并不赞成这个理论.
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