Computers have brought about many changes in our world. With the devek,pment of science and technology, the use of eleclronic computers is growing year by year in various fields of man' s activities. They have been of great help in scietific rescarch and engi neering They can do at a very high speed the calculations too complicated for a man to do in a few days or even in a few years.

　　计算机给我们的世界带来了许多变化，随着科学技术的发展，计算机在人类活动的各个领域中的使用年年增长，计算机对科学研究和工程学帮助很大，它们能以很快的速度运算，这些运算很复杂，要用人工运算需要几天甚至是几年。