文档介绍：智课网 TOEFL 备考资料托福独立写作范文: Scientific Theories 摘要:托福独立写作范文: Scientific Theories ,新托福考试写作考生想拿高分,肚子里必须有点墨水,背上一篇两篇优秀范文,以备不时只需。以下这篇范文的题目是: Scientific Theories 。 In science, a theor 托福独立写作范文: Scientific Theories ,新托福考试写作考生想拿高分,“肚子里必须有点墨水”,背上一篇两篇优秀范文,以备不时只需。以下这篇范文的题目是: Scientific Theories 。 In science, a theory isa 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 ic molecular theory, in which gases are pictured as being made up of many small particles that are in constant motion. A useful theory, in addition to explaining past observations, helps to predict events that have not as yet been observed. After a theory has been publicized, scientists design experiments to test the theory. If observations confirm the scientist ’s predictions, the theory is supported. If observations do not confirm the predictions, the scientists must search further. There may bea fault in the experiment, or the theory may have to be revised or rejected. Science involves imagination and creative thinking as well as collecting information and performing experiments. Facts by themselves are not science. As the mathematician Jules Henri Poincare said, “ Science is built with facts just asa house is built with bricks, but a collection of facts canno