GRE写作范文积累:Scientific Theories.doc第2页 /总页数 3 页 GRE写作范文积累:Scientific Theories 【#GRE# 导语】备考恰恰像马拉松赛跑一样,只有坚持到最后的人,才能称为胜利者,备考全面启动。为了帮助大家坚持学****高效备考,无忧考网整理提供了“GRE写作范文积累:Scientific Theories”,欢迎阅读参考!更多相关讯息请关注无忧考网! 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 kinetic 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 be a 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 as a house is built with bricks, but a collection of facts cannot be called science any more than a pile of bricks can be called a house.”