托福写作范文之Scientific Theories

托福写作高分比率低，南京新航道托福培训老师建议学生可以积累一篇两篇范文，加以借鉴学习相信会有辅助作用，以下是新航道托福频道与大家分享的托福写作范文：Scientific Theories。

　　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.

托福写作范文不建议同学们照搬照抄，考试时如果遇到类似题目照搬上去，这并不能考察考生的写作能力。托福培训课程中多背一些范文，可以积累一些素材，像好的短语、词、句等，灵活运用。

南京新航道学校提供专业的雅思培训、托福培训、GRE培训、SAT培训、ACT培训剑桥青少英语培训等，帮助广大学子“用英语点亮人生”。