当前位置:网校排名 > 新东方在线 > 新东方在线资讯 > 托福IBT必背经典文章:科学原理

新东方在线

托福IBT必背经典文章:科学原理

发布时间:2016-04-20 来源:新东方在线 发布人:zolo

新东方在线0元免费畅学窗口

托福IBT必背经典文章:科学原理

【新东方托福IBT必背50篇经典文章:科学原理这份资料可以帮助考生在托福网考备考过程中,提高托福口语水平,同时对提高托福写作水平和托福阅读都有很大帮助。托福IBT必背50篇经典文章,助你托福考试成功!

新东方托福IBT必背50篇经典文章:科学原理

Scientific Theories

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.”

Most scientists start an investigation by finding out what other scientists have learned about a particular problem. After known facts have been gathered, the scientist comes to the part of the investigation that requires considerable imagination. Possible solutions to the problem are formulated. These possible solutions are called hypotheses.

In a way, any hypothesis is a leap into the unknown. It extends the scientist’s thinking beyond the known facts. The scientist plans experiments, performs calculations, and makes observations to test hypotheses. Without hypothesis, further investigation lacks purpose and direction. When hypotheses are confirmed, they are incorporated into theories.

编辑推荐》

新东方托福培训

托福培训冲刺班

托福辅导视频



上一篇:托福IBT必背经典文章:火力发电厂

下一篇:高二历史教案 美国联邦政府的建立教案

相关阅读

老师推荐

扩展阅读