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  • scientific research 日期:2009-05-17 12:23:34 来源:作文地带 好评:优秀英语作文

    In science, a theory is a reasonable explanation of observed events that are related. A theory often involves an imaginary model that helps scientists picture the way an observed event could be produced. A good example of this is found in the kineti...

    be The are To of in is theory

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