英语翻译the first generation of computers,which used vacuum tube

英语翻译
the first generation of computers,which used vacuum tubes,came out in the late 1940s.univac I is an example of these computers which could perform thousands of calculations per second.in 1960,the second generation of computers was develop and these could perform work ten times faster than their predecessor.the reason for this extra speed was the use of transistors instead of vacuum tubes the second-generation computers were smaller,faster and more dependable than first-generation computers.the third-generation computers appeared on the market in 1965.these computers could do a million calculations a second,which is 1000 times as many as first-generation computers.unlike second-generation computers,these are controlled by tiny integrated
circuits and are consequently smaller and more dependable.fourth-generation computers have now
arrived,and the integrated circuits that are being developed have been greatly reduced in size.
this is due to microminiaturization,which means that the circuits are much smaller than before；as
many as 1000 tiny circuits now fit onto a single chip.a chip is a square or tectangular piece of silicon,usually from 1/10 to 1/4 inch,upon which serveral layers of an integrated circuit are etched or imprinted,after which the circuit is encapsulated in plastic,ceramic or metal.fourth-generation computers are 50 times faster than third-generation computers and can complete approximately 1000000 instructions per second.

他第一代计算机,使用真空管,走出了上个世纪1940 s .univac我是一个例子,这些计算机可执行每second.成千上万的计算1960年,第二代计算机的发展,这些问题可能是完成工作的比他们的前任的快十倍.这额外的速度的原因是使用晶体管代替真空管第二代计算机变得愈来愈小、愈来愈快和更可靠的比第一代计算机.第三代计算机开始在市场上出现这些计算机能做1965.计算一百万次第二,1000倍computers.与第一代计算机,这些微小的综合控制
电路,因此更小和更dependable.第四代计算机现在所拥有的一切
到了,目前正在开发的集成电路,已经大大缩小.
这是由于微型化,这意味着这些电路是比以前小得多;
现在1000多微小的电路适合在一个chip.a芯片是正方形或tectangular块硅,通常从1/10至英寸,在此基础上提出几个层次的集成电路或铭记雕刻,之后在电路封装类型可以是塑料型、陶瓷或metal.fourth-generation电脑是50倍并能完成第三代电脑每秒大约1000000指令.