了解科技英语特点课件.pptVIP

Computer English ;Key points:  useful terms and definitions of computersDifficult points:  describing the features of computers of each generation;Requirements:;New Words Expressions: computerlike a. 计算机似的 electromechanical a. 机电的, 电机的 vacuum tubes 真空管 Census Bureau 人口普查局 thousands of 成千上万的 known as 通常所说的，以……著称 ; It is hard to say exactly when the modern computer was invented. Starting in the 1930s and through the 1940s, a number of machines were developed that were like computers. But most of these machines did not have all the characteristics that we associate with computers today. These characteristics are that the machine is electronic, that it has a stored program, and that it is general purpose. 很难确切地说现代计算机是什么时候发明的。从20世纪30年代到40年代，制造了许多类似计算机的机器。但是这些机器大部分没有今天我们所说的计算机的所有特征。这些特性是：机器是电子的，具有储存的程序, 而且是通用的。;1.1 The Invention of the Computer ;1.1.1 The ENIAC Perhaps the most influential of the early computerlike devices was the Electronic Numerical Integrator and Computer, or ENIAC. It was developed by J. Presper Eckert and John Mauchly at the University of Pennsylvania. The project began in 1943 and was completed in 1946. The machine was huge; it weighed 30 tons and contained over 18,000 vacuum tubes. 也许早期最具影响力的类似计算机的装置应该是电子数字积分计算机，或简称ENIAC。它是由宾夕凡尼亚大学的J. Presper Eckert 和John Mauchly 研制的。该工程于1943年开始，并于1946年完成。这台机器极其庞大，重达30吨，而且包含18,000多个真空管。;1.1.1 The ENIAC The ENIAC was a major advancement for its time. It was the first general-purpose, electronic computing machine and was capable of performing thousands of operations per second. It was controlled, however, by switches and plugs that had to be manually set. Thus, although it was a general-purpose electronic device, it did not have a stored program. Therefore, it did not have all the characteristics of a computer . ENIAC是当时重要的成就。它是第一台通用型电子计算机器，并能够执行每秒数千次运算。然而,它是由开关和继电器控制的，必须手工设定。 因此，虽然它是一个通用型电子装置，但是它没有储存程序。 因此,它不具备计算机的所有特征。 ;1.1.1 The ENIAC While working on the ENIAC, Eckert and