因此，随着第二代计算机的出现，计算机的体积和成本降低、速度提高，且它们对空调的需要减少。
Hence, with second-generation computers, the size and cost of computers decreased, their speed increased, and their air-conditioning needs were reduced.
虽然为第一代和第二代计算机开发了简单的操作系统，许多现代操作系统的特征首先在第三代期间出现。
Although simple operating systems were developed for first-and second-generation computers, many of the features of modern operating systems first appeared during the third generation.
在教室里的一个告示牌上，希尔利贴出了一篇关于苹果第二代计算机的文章，那些机器去年就被正式宣布过时了。
On a bulletin board in his classroom, Shiery has posted a story about Apple II computers, declared officially obsolete last year.
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