|
考研英语作文1900字：Scientific Theories in science, a theory is a reasonable eplanation 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 eample 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 eplaining past observations, helps to predict events that have not as yet been observed. after a theory has been publicized, scientists design eperiments to test the theory. if observations confirm the scientists predictions, the theory is supported. if observations do not confirm the predictions, the scientists must search further. there may be a fault in the eperiment, or the theory may have to be revised or rejected. science involves imagination and creative thinking as well as collecting information and performing eperiments. 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.
in a way, any hypothesis is a leap into the unknown. it etends the scientists thinking beyond the known facts. the scientist plans eperiments, 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. scientific theories,此文章版权归原作者所有! |