英语四级

考研翻译考研听力考研作文考研完形考研阅读考研复习考研真题考研词汇考研口试考研大纲

新东方考研英语作文155篇:Scientific Theories

jo19870724 于2010-04-29发布 l 已有人浏览
增大字体 减小字体
In science, a theory is a reasonable explanation of observed events that are related. A theory often involves

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.

 1 2 3 下一页

分享到

添加到收藏

考研作文排行