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The theory predicts low speeds and therefore safety.
He had a theory that the germs caused disease.
the theory and practice of education
psychoanalytic/Marxist/literary theory
I have my own theory about why he resigned.
There is a theory that her death was an accident.
英语词典包含67175条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。